text:
Dead Trigger
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Dead Trigger
App Store icon
Developer(s)
Madfinger Games
Publisher(s)
Madfinger Games
Engine
Unity
Platform(s)
iOS, Android
Release
June 26, 2012
Genre(s)
First-person shooter, survival horror, action role-playing
Mode(s)
Single-player
Dead Trigger is a zombie-themed first person survival horror video game developed and published by Madfinger Games. It was released in June 2012 for iOS and Android mobile devices. The game is single-player only. A sequel, Dead Trigger 2, was released in 2013.
Contents
[hide]
1 Gameplay
2 Storyline
3 Release
4 Reception
5 Sequel
6 References
Gameplay[edit]
The game starts at the map screen, where the player can select currently available missions or access in-game features including a shop, casino, and arena. There are always several generic missions available, as well as story missions. Additionally, the player can play a bonus mission each day for a small gold bonus.
Dead Trigger includes two forms of currency: cash and gold. Cash is earned in missions, by dismembering zombies, collecting cash briefcases, and completing objectives. Gold can be earned in the daily bonus mission, and the player is awarded one gold each time they level up. However, gold is included primarily as a microtransaction and advertising element - the player can buy gold with real money or earn gold by downloading other games.
Cash and gold can be used to purchase weapons, equipment, and character upgrades. Weapons are mostly based on real-life firearms such as the Colt M1911A1 and AK-47. Dead Trigger offers pistols, rifles, shotguns, machine guns, and melee weapons. Items include medkits and sentry turrets. Character upgrades include additional item slots and health.
Dead Trigger offers a basic progression system where the player gains experience points and can level up, but leveling up only unlocks new weapons and items in the shop.
All missions fall into several basic types, such as defending doors or killing a certain number of zombies. There are a limited number of locations that are reused frequently in both story and random missions. Another game mode is the arena, which is a wave-based survival mode.
Storyline[edit]
The game is set in a world where a plague of an unknown source has killed billions of people and many others turned into dangerous creatures. The rest of humanity is desperately trying to survive in this world. Kyle, the protagonist of the game, meets a group of survivors led by Julian Lassagne that created a colony known as New Hope. He joins them and helps them survive. The group also finds a government-run underground bunker and slowly searches it floor by floor. They eventually find out that the plague was planned by a wealthy group. The storyline ends as Julian and Kyle decides to go after them.
Release[edit]
The game started on iOS as a paid app and was later added as a paid app to Android. The developers eventually switched to a free-to-play model supported by in-app purchases due to "unbelievably high" piracy.[1]
Dead Trigger has had over 23 million downloads, on all platforms, as of October 2013.[2]
Reception[edit]
According to review aggregating website Metacritic, the iOS version of the game received an average review score of 70 out of 100 based on 15 reviews.[3] CNET gave Dead Trigger 4 out of 5, praising many gameplay elements but criticizing how long it takes to collect gold without using in-app purchase.[4] Modojo gave Dead Trigger 4.5 out of 5, praising the game's graphics and gameplay but noting the lack of variety as the game goes on.[5]
Sequel[edit]
During NVIDIA's CES 2013 press conference Dead Trigger 2 was revealed, used as a tech demo to demonstrate the power of the upcoming Tegra 4. The press conference showed a short gameplay video featuring a massive enemy. Dead Trigger 2 was released on October 23, 2013.[6]
References[edit]
Jump up ^ "How high is 'unbelievably high' piracy? Dead Trigger dev's not saying". Android Central. Retrieved 2012-10-22.
Jump up ^ https://itunes.apple.com/us/app/dead-trigger-2/id720063540?mt=8&ign-mpt=uo%3D4
Jump up ^ http://www.metacritic.com/game/ios/dead-trigger
Jump up ^ Cabebe, Jaymar (2012-08-22). "Dead Trigger Review - Software - CNET Reviews". Reviews.cnet.com. Retrieved 2012-10-22.
Jump up ^ http://www.modojo.com/reviews/dead_trigger
Jump up ^ http://www.mobiletechreview.com/ubbthreads/showflat.php?Number=44044
[hide]
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Madfinger Games
Games
Dead Trigger series
Dead Trigger
2
Shadowgun series
Shadowgun
Deadzone
Legends
Samurai series
Samurai: Way of the Warrior
Samurai II: Vengeance
Other Games
BloodyXmas
Monzo
Unkilled
Retrieved from "https://en.wikipedia.org/w/index.php?title=Dead_Trigger&oldid=798854117"
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South African Democratic Teachers Union
From Wikipedia, the free encyclopedia
Jump to: navigation, search
SADTU
Full name
South African Democratic Teachers Union
Founded
6 October 1990
Members
254,000
Affiliation
COSATU
Key people
Magope Maphila, president
Mugwena Maluleke, general secretary
Office location
Johannesburg, South Africa
Country
South Africa
Website
www.sadtu.org.za
The South African Democratic Teachers Union (SADTU) is the largest[1] trade union for teachers in South Africa. It is allied to the African National Congress[2] and is an affiliate of the Congress of South African Trade Unions (COSATU).
The union has rejected a proposal by the Department of Basic Education (DBE) for performance-agreement contracts for school principals, pointing out that employment contracts already outlines principals' obligations, and claiming that such performance agreements would be unfair in the light of poor resourcing and lack of skills at schools.[3]
In 2017, the National Education Collaboration Trust began work with SADTU to improve teaching at the basic education level in the Eastern Cape and Limpopo provinces.[4]
Contents
[hide]
1 Jobs for cash
2 KwaZulu-Natal
3 Criticism
4 References
5 External links
Jobs for cash[edit]
In April, 2014, City Press reported that SADTU officials were running a racket, which involved accepting monetary bribes from educators in return for access to teaching or managerial positions.[5] SADTU responded that the union was "only party to the filling of posts as observers to ensure the fairness" of the process.[6]
The DBE subsequently set up a ministerial task team (MTT), headed by Professor John Volmink, to investigate. The MTT indicated that six provinces were affected by the racketeering: the North West, KwaZulu-Natal, Gauteng, Limpopo, Mpumalanga, and the Eastern Cape.[7] Gauteng Education MEC Panyaza Lesufi admitted that his department was controlled by SADTU, and that the selling and buying of educational posts was "endemic".[8] The Minister of Basic Education Angie Motshekga observed that the investigations implicated primarily SADTU,[9] although other teachers unions and government officials were also involved.[10][11]
The dysfunction in schools was attributed to "weak" government systems that had been "infiltrated" by a "complex patronage system".[12][13] The report's conclusion was that SADTU's membership in the ANC's tripartite alliance gave it “enormous power and influence” over the education system, described the situation as “dangerous and inappropriate”, and found that it held the education system hostage to political processes.[8]
Following the release of the MTT's report, which SADTU had stalled until May, 2016,[14] NAPTOSA, the second-largest teachers union in the country, welcomed the "honest attempt to address a vexing problem" but accused the Volmink team of "union-bashing"; NATU, the third-largest teachers union, found the investigation lacking, and the following year called for a judicial commission of inquiry, which would be able to more substantively investigate the issue due to its judicial powers.[15] SADTU objected that they were being singled out for scapegoating for the ills of South Africa's education system, and insisted that there was no evidence that SADTU had facilitated improper conduct.[16]
A similar report by the SA Council of Educators found that the union as a whole had been involved, not just "a few rogue elements", as SADTU had maintained.[17]
KwaZulu-Natal[edit]
SADTU has blamed KwaZulu-Natal's provincial education department for the educator shortages in the province, blaming "the redistribution of teachers as a result of a post provisioning norms process". 2 800 teaching posts remained unfilled in the province in February, 2017.[18]
Criticism[edit]
The Economist, characterising South Africa's educational system as "one of the worst in the world", placed the blame on SADTU for "a lack of accountability and the abysmal quality of most teachers".[2]
The Department of Basic Education itself has identified SADTU as an obstruction to government efforts to improve education, with Minister Motshekga describing the union's influence as a "stranglehold" on education.[11]
References[edit]
Jump up ^ Mail & Guardian, 12 February 2013, Bongani Nkosi, Sadtu pickets for Soobrayan's head
^ Jump up to: a b "South Africa has one of the world’s worst education systems". The Economist. Retrieved 2017-05-04.
Jump up ^ Phakathi, Bekezela (2014-05-04). "Sadtu reiterates rejection of appraisals for principals". Retrieved 2017-05-04.
Jump up ^ Phakathi, Bekezela (2017-01-19). "Education trust to train teachers at weak schools". Retrieved 2017-05-04.
Jump up ^ Harper, Paddy; Masondo, Sipho. "How Sadtu sells its posts". News24. Archived from the original on 2014-04-30. Retrieved 2017-05-04.
Jump up ^ Caluza, Caluza; Shandu, Bheki (2015-05-19). "Our response to City Press` jobs-for-sale claims - SADTU KZN". www.politicsweb.co.za. Retrieved 2017-05-04.
Jump up ^ Masondo, Sipho (2016-05-31). "Education in South Africa: A system in crisis". CityPress. Retrieved 2017-05-04.
^ Jump up to: a b Masondo, Sipho (2016-05-15). "‘Break Sadtu’s power’". CityPress. Retrieved 2017-05-04.
Jump up ^ Bendile, Dineo. "Damning report exposes rot in Sadtu". Retrieved 2017-05-04.
Jump up ^ Tandwa, Lizeka (2015-12-17). "Sadtu accused of selling teaching posts". News24. Retrieved 2017-05-04.
^ Jump up to: a b Jansen, Leanne (2015-12-18). "Education ‘rotten from bottom to top’". Independent Online. Retrieved 2017-05-04.
Jump up ^ Reporter, Bongekile Macupe Education (2015-12-18). "Bid to end selling of teacher posts". Sowetan LIVE. Retrieved 2017-05-04.
Jump up ^ Masondo, Sipho (2015-05-17). "Sadtu selling principals’ posts in exchange for cows, sheep and goats". News24. Retrieved 2017-05-04.
Jump up ^ Mlambo, Sihle; Nxumalo, Mphathi (2016-05-06). "Sadtu in fresh protest over cash-for-jobs report". Independent Online. Retrieved 2017-05-04.
Jump up ^ Masondo, Sipho (2016-05-22). "Union wants new jobs-for-cash probe". CityPress. Retrieved 2017-05-04.
Jump up ^ Taunyane, Omogolo (2016-05-23). "'We are being used as a scapegoat', says Sadtu on jobs-for-cash scandal report". 702. Retrieved 2017-05-04.
Jump up ^ Masondo, Sipho (2015-12-20). "How Sadtu captured the state". CityPress. Retrieved 2017-05-04.
Jump up ^ Mthethwa, Bongani (2017-02-09). "No teachers in KwaZulu-Natal for critical subjects". Business Day. Retrieved 2017-05-04.
External links[edit]
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Gulf of Mexico
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Gulf of Mexico
Bathymetry of the Gulf of Mexico
Location
American Mediterranean Sea
Coordinates
25°N 90°W / 25°N 90°W / 25; -90 (Gulf of Mexico)Coordinates: 25°N 90°W / 25°N 90°W / 25; -90 (Gulf of Mexico)
River sources
Rio Grande, Mississippi River
Ocean/sea sources
Atlantic Ocean, Caribbean Sea
Basin countries
United States
Mexico
Cuba
Max. width
1,500 km (932.06 mi)
Surface area
1,550,000 km2 (600,000 sq mi)
Settlements
Houston, New Orleans, Corpus Christi, Tampa, Havana, Campeche, Mobile, Gulfport, Tampico, Key West
Galveston harbor by Verner Moore White
Ship and oil rigs in the Gulf
The Gulf of Mexico (Spanish: Golfo de México) is an ocean basin and a marginal sea of the Atlantic Ocean,[1] largely surrounded by the North American continent.[2] It is bounded on the northeast, north and northwest by the Gulf Coast of the United States, on the southwest and south by Mexico, and on the southeast by Cuba. The U.S. states of Texas, Louisiana, Mississippi, Alabama and Florida border the Gulf on the north, which are often referred to as the "Third Coast" in comparison with the U.S. Atlantic and Pacific coasts, or sometimes the "south coast", in juxtaposition to the Great Lakes region being the "north coast."
The Gulf of Mexico formed approximately 300 million years ago as a result of plate tectonics.[3] The Gulf of Mexico basin is roughly oval and is approximately 810 nautical miles (1,500 km; 930 mi) wide and floored by sedimentary rocks and recent sediments. It is connected to part of the Atlantic Ocean through the Florida Straits between the U.S. and Cuba, and with the Caribbean (with which it forms the American Mediterranean Sea) via the Yucatán Channel between Mexico and Cuba. With the narrow connection to the Atlantic, the Gulf experiences very small tidal ranges. The size of the Gulf basin is approximately 1.6 million km2 (615,000 sq mi). Almost half of the basin is shallow continental shelf waters. The basin contains a volume of roughly 2,500 quadrillion liters (550 quadrillion Imperial gallons, 660 quadrillion US gallons, 2.5 million km3 or 600,000 cu mi).[4] The Gulf of Mexico is one of the most important offshore petroleum production regions in the world, comprising 1 in 6 barrels produced in the United States.[5]
Contents
[hide]
1 Extent
2 Geology
3 History
3.1 European exploration
4 Shipwrecks
5 Geography
5.1 2006 earthquake
5.2 Maritime boundary delimitation agreements
6 Biota
7 Pollution
7.1 Ixtoc I explosion and oil spill
7.2 Deepwater Horizon explosion and oil spill
7.3 Minor oil spills
7.3.1 Brutus oil spill
8 See also
9 References
10 External links
Extent[edit]
The International Hydrographic Organization defines the southeast limit of the Gulf of Mexico as follows:[6]
A line leaving Cape Catoche Light (21°37′N 87°04′W / 21.617°N 87.067°W / 21.617; -87.067) with the Light on Cape San Antonio in Cuba, through this island to the meridian of 83°W and to the Northward along this meridian to the latitude of the South point of the Dry Tortugas (24°35'N), along this parallel Eastward to Rebecca Shoal (82°35'W) thence through the shoals and Florida Keys to the mainland at eastern end of Florida Bay, all the narrow waters between the Dry Tortugas and the mainland being considered to be within the Gulf.
Geology[edit]
Sediment in the Gulf of Mexico
The consensus among geologists[3][7][8] who have studied the geology of the Gulf of Mexico, is that before the Late Triassic, the Gulf of Mexico did not exist. Before the Late Triassic, the area now occupied by the Gulf of Mexico consisted of dry land, which included continental crust that now underlies Yucatán, within the middle of the large supercontinent of Pangea. This land lay south of a continuous mountain range that extended from north-central Mexico, through the Marathon Uplift in West Texas and the Ouachita Mountains of Oklahoma, and to Alabama where it linked directly to the Appalachian Mountains. It was created by the collision of continental plates that formed Pangea. As interpreted by Roy Van Arsdale and Randel T. Cox, this mountain range was breached in Late Cretaceous times by the formation of the Mississippi Embayment.[9][10]
Geologists and other Earth scientists agree in general that the present Gulf of Mexico basin originated in Late Triassic time as the result of rifting within Pangea.[11] The rifting was associated with zones of weakness within Pangea, including sutures where the Laurentia, South American, and African plates collided to create it. First, there was a Late Triassic-Early Jurassic phase of rifting during which rift valleys formed and filled with continental red beds. Second, as rifting progressed through Early and Middle Jurassic time, continental crust was stretched and thinned. This thinning created a broad zone of transitional crust, which displays modest and uneven thinning with block faulting, and a broad zone of uniformly thinned transitional crust, which is half the typical 40 kilometer thickness of normal continental crust. It was at this time that rifting first created a connection to the Pacific Ocean across central Mexico and later eastward to the Atlantic Ocean. This flooded the opening basin to create the Gulf of Mexico as an enclosed marginal sea. While the Gulf of Mexico was a restricted basin, the subsiding transitional crust was blanketed by the widespread deposition of Louann Salt and associated anhydrite evaporites. During the Late Jurassic, continued rifting widened the Gulf of Mexico and progressed to the point that sea-floor spreading and formation of oceanic crust occurred. At this point, sufficient circulation with the Atlantic Ocean was established that the deposition of Louann Salt ceased.[7][8][12][13]. Seafloor spreading stopped at the end of Jurassic time, about 145-150 million ears ago.
During the Late Jurassic through Early Cretaceous, the basin occupied by the Gulf of Mexico experienced a period of cooling and subsidence of the crust underlying it. The subsidence was the result of a combination of crustal stretching, cooling, and loading. Initially, the combination of crustal stretching and cooling caused about 5–7 km of tectonic subsidence of the central thin transitional and oceanic crust. Because subsidence occurred faster than sediment could fill it, the Gulf of Mexico expanded and deepened.[7][13][14]
Later, loading of the crust within the Gulf of Mexico and adjacent coastal plain by the accumulation of kilometers of sediments during the rest of the Mesozoic and all of the Cenozoic further depressed the underlying crust to its current position about 10–20 km below sea level. Particularly during the Cenozoic, thick clastic wedges built out the continental shelf along the northwestern and northern margins of the Gulf of Mexico.[7][13][14]
To the east, the stable Florida platform was not covered by the sea until the latest Jurassic or the beginning of Cretaceous time. The Yucatán platform was emergent until the mid-Cretaceous. After both platforms were submerged, the formation of carbonates and evaporites has characterized the geologic history of these two stable areas. Most of the basin was rimmed during the Early Cretaceous by carbonate platforms, and its western flank was involved during the latest Cretaceous and early Paleogene periods in a compressive deformation episode, the Laramide Orogeny, which created the Sierra Madre Oriental of eastern Mexico.[15]
In 2002 geologist Michael Stanton published a speculative essay suggesting an impact origin for the Gulf of Mexico at the close of the Permian, which could have caused the Permian–Triassic extinction event.[16] However, Gulf Coast geologists do not regard this hypothesis as having any credibility. Instead they overwhelmingly accept plate tectonics, not an asteroid impact, as having created the Gulf of Mexico as illustrated by papers authored by Kevin Mickus and others.[3][8][13][17] This hypothesis is not to be confused with the Chicxulub Crater, a large impact crater on the coast of the Gulf of Mexico on the Yucatán Peninsula. Increasingly, the Gulf of Mexico is regarded as a backarc basin behind the Jurassic Nazas Arc of Mexico >Stern, R.J., and Dickinson, W.R., 2010. The Gulf of Mexico is a Jurassic back-arc Basin. Geosphere v. 6; no. 6; p. 739–754; doi: 10.1130/GES00585.1 </ref>
Today, the Gulf of Mexico has the following 7 main areas:[15]
Gulf of Mexico basin, which contains the Sigsbee Deep and can be further divided into the continental rise, the Sigsbee Abyssal Plain, and the Mississippi Cone.
Northeast Gulf of Mexico, which extends from a point east of the Mississippi River Delta near Biloxi to the eastern side of Apalachee Bay.
South Florida Continental Shelf and Slope, which extends along the coast from Apalachee Bay to the Straits of Florida and includes the Florida Keys and Dry Tortugas.
Campeche Bank, which extends from the Yucatán Straits in the east to the Tabasco–Campeche Basin in the west and includes Arrecife Alacran.
Bay of Campeche, which is an isthmian embayment extending from the western edge of Campeche Bank to the offshore regions just east of the port of Veracruz.
Western Gulf of Mexico, which is located between Veracruz to the south and the Rio Grande to the north.
Northwest Gulf of Mexico, which extends from Alabama to the Rio Grande.
History[edit]
European exploration[edit]
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Fishing boats in Biloxi
Graph showing the overall water temperature of the Gulf between Hurricanes Katrina and Rita. Although Katrina cooled waters in its path by up to 4 °C, they had rebounded by the time of Rita's appearance.
Although Christopher Columbus was credited with the discovery of the Americas by Europeans, the ships in his four voyages never reached the Gulf of Mexico. Instead, Columbus sailed into the Caribbean around Cuba and Hispaniola. The first European exploration of the Gulf of Mexico was by Amerigo Vespucci in 1497. He followed the coastal land mass of Central America before returning to the Atlantic Ocean via the Straits of Florida between Florida and Cuba. In his letters, Vespucci described this trip, and once Juan de la Cosa returned to Spain, a famous world map, depicting Cuba as an island, was produced.
In 1506, Hernán Cortés took part in the conquest of Hispaniola and Cuba, receiving a large estate of land and Indian slaves for his effort. In 1510, he accompanied Diego Velázquez de Cuéllar, an aide of the governor of Hispaniola, in his expedition to conquer Cuba. In 1518 Velázquez put him in command of an expedition to explore and secure the interior of Mexico for colonization.
In 1517, Francisco Hernández de Córdoba discovered the Yucatán Peninsula. This was the first European encounter with an advanced civilization in the Americas, with solidly built buildings and a complex social organization which they recognized as being comparable to those of the Old World; they also had reason to expect that this new land would have gold. All of this encouraged two further expeditions, the first in 1518 under the command of Juan de Grijalva, and the second in 1519 under the command of Hernán Cortés, which led to the Spanish exploration, military invasion, and ultimately settlement and colonization known as the Conquest of Mexico. Hernández did not live to see the continuation of his work: he died in 1517, the year of his expedition, as the result of the injuries and the extreme thirst suffered during the voyage, and disappointed in the knowledge that Diego Velázquez had given precedence to Grijalva as the captain of the next expedition to Yucatán.
In 1523, Ángel de Villafañe sailed toward Mexico City, but was shipwrecked en route along the coast of Padre Island, Texas, in 1554. When word of the disaster reached Mexico City, the viceroy requested a rescue fleet and immediately sent Villafañe marching overland to find the treasure-laden vessels. Villafañe traveled to Pánuco and hired a ship to transport him to the site, which had already been visited from that community. He arrived in time to greet García de Escalante Alvarado (a nephew of Pedro de Alvarado), commander of the salvage operation, when Alvarado arrived by sea on July 22, 1554. The team labored until September 12 to salvage the Padre Island treasure. This loss, in combination with other ship disasters around the Gulf of Mexico, gave rise to a plan for establishing a settlement on the northern Gulf Coast to protect shipping and more quickly rescue castaways. As a result, the expedition of Tristán de Luna y Arellano was sent and landed at Pensacola Bay on August 15, 1559.
On December 11, 1526, Charles V granted Pánfilo de Narváez a license to claim what is now the Gulf Coast of the United States, known as the Narváez expedition. The contract gave him one year to gather an army, leave Spain, be large enough to found at least two towns of 100 people each, and garrison two more fortresses anywhere along the coast. On April 7, 1528, they spotted land north of what is now Tampa Bay. They turned south and traveled for two days looking for a great harbor the master pilot Miruelo knew of. Sometime during these two days, one of the five remaining ships was lost on the rugged coast, but nothing else is known of it.
In 1697, Pierre Le Moyne d'Iberville sailed for France and was chosen by the Minister of Marine to lead an expedition to rediscover the mouth of the Mississippi River and to colonize Louisiana which the English coveted. Iberville's fleet sailed from Brest on October 24, 1698. On January 25, 1699, Iberville reached Santa Rosa Island in front of Pensacola founded by the Spanish; he sailed from there to Mobile Bay and explored Massacre Island, later renamed Dauphin Island. He cast anchor between Cat Island and Ship Island; and on February 13, 1699, he went to the mainland, Biloxi, with his brother Jean-Baptiste Le Moyne de Bienville.[18] On May 1, 1699, he completed a fort on the north-east side of the Bay of Biloxi, a little to the rear of what is now Ocean Springs, Mississippi. This fort was known as Fort Maurepas or Old Biloxi. A few days later, on May 4, Pierre Le Moyne sailed for France leaving his teenage brother, Jean-Baptiste Le Moyne, as second in command to the French commandant.
Shipwrecks[edit]
The Mardi Gras shipwreck around the early-19th century about 35 miles off the coast of Louisiana in 4,000 feet (1220 meters) of water. She is believed to have been a privateer or trader. The shipwreck, whose real identity remains a mystery, lay forgotten at the bottom of the sea until it was discovered in 2002 by an oilfield inspection crew working for the Okeanos Gas Gathering Company (OGGC). In May 2007, an expedition, led by Texas A&M University and funded by OGGC under an agreement with the Minerals Management Service (now BOEM), was launched to undertake the deepest scientific archaeological excavation ever attempted at that time to study the site on the seafloor and recover artifacts for eventual public display in the Louisiana State Museum. As part of the project educational outreach Nautilus Productions in partnership with BOEM, Texas A&M University, the Florida Public Archaeology Network[19] and Veolia Environmental produced a one-hour HD documentary[20] about the project, short videos for public viewing and provided video updates during the expedition. Video footage from the ROV was an integral part of this outreach and used extensively in the Mystery Mardi Gras Shipwreck documentary.[21]
On July 30, 1942 the Robert E. Lee, captained by William C. Heath, was torpedoed by the German submarine U-166. She was sailing southeast of the entrance to the Mississippi River when the explosion destroyed the #3 hold, vented through the B and C decks and damaged the engines, the radio compartment and the steering gear. After the attack she was under escort by the USS PC-566, captained by LCDR Herbert G. Claudius, en route to New Orleans. The USS PC-566 began dropping depth charges on a sonar contact, sinking the U-166. The badly damaged Robert E. Lee first listed to port then to starboard and finally sank within about 15 minutes of the attack. One officer, nine crewmen and 15 passengers were lost. Ironically the passengers aboard the Robert E. Lee were primarily survivors of previous torpedo attacks by German U-boats.[22] The wreck's precise location was discovered during the C & C Marine survey that located the U-166.
The German submarine U-166 was a Type IXC U-boat of Nazi Germany's Kriegsmarine during World War II. The submarine was laid down on December 6, 1940 at the Seebeckwerft (part of Deutsche Schiff- und Maschinenbau AG, Deschimag) at Wesermünde (modern Bremerhaven) as yard number 705, launched on November 1, 1941 and commissioned on March 23, 1942 under the command of Oberleutnant zur See Hans-Günther Kuhlmann. After training with the 4th U-boat Flotilla, U-166 was transferred to the 10th U-boat Flotilla for front-line service on June 1, 1942. The U-boat sailed on only two war patrols and sank four ships totalling 7,593 gross register tons (GRT).[23] She was sunk on July 30, 1942 in Gulf of Mexico.[24]
In 2001 the wreck of U-166 was found in 5,000 feet (1,500 m) of water, less than two miles from where it had attacked the Robert E. Lee. An archaeological survey of the seafloor before construction of a natural gas pipeline led to the discoveries by C & C Marine archaeologists Robert A. Church and Daniel J. Warren. The sonar contacts consisted of two large sections lying approximately 500 feet apart at either end of a debris field that indicated the presence of a U-boat.[25]
Geography[edit]
Gulf beach near Sabine Pass
The Mississippi River Watershed is the largest drainage basin of the Gulf of Mexico Watershed.[26]
Map of northern part of Gulf of Mexico
The shaded relief map of the Gulf of Mexico and Caribbean area.[27][28]
The Gulf of Mexico's eastern, northern, and northwestern shores lie along the US states of Florida, Alabama, Mississippi, Louisiana, and Texas. The US portion of the Gulf coastline spans 1,680 miles (2,700 km), receiving water from 33 major rivers that drain 31 states.[29] The Gulf's southwestern and southern shores lie along the Mexican states of Tamaulipas, Veracruz, Tabasco, Campeche, Yucatán, and the northernmost tip of Quintana Roo. The Mexican portion of the Gulf coastline spans 1,743 miles (2,805 km). On its southeast quadrant the Gulf is bordered by Cuba. It supports major American, Mexican and Cuban fishing industries. The outer margins of the wide continental shelves of Yucatán and Florida receive cooler, nutrient-enriched waters from the deep by a process known as upwelling, which stimulates plankton growth in the euphotic zone. This attracts fish, shrimp, and squid.[30] River drainage and atmospheric fallout from industrial coastal cities also provide nutrients to the coastal zone.
The Gulf Stream, a warm Atlantic Ocean current and one of the strongest ocean currents known, originates in the gulf, as a continuation of the Caribbean Current-Yucatán Current-Loop Current system. Other circulation features include the anticyclonic gyres which are shed by the Loop Current and travel westward where they eventually dissipate, and a permanent cyclonic gyre in the Bay of Campeche. The Bay of Campeche in Mexico constitutes a major arm of the Gulf of Mexico. Additionally, the gulf's shoreline is fringed by numerous bays and smaller inlets. A number of rivers empty into the gulf, most notably the Mississippi River and Rio Grande in the northern gulf, and the Grijalva and Usumacinta rivers in the southern gulf. The land that forms the gulf's coast, including many long, narrow barrier islands, is almost uniformly low-lying and is characterized by marshes and swamps as well as stretches of sandy beach.
The Gulf of Mexico is an excellent example of a passive margin. The continental shelf is quite wide at most points along the coast, most notably at the Florida and Yucatán Peninsulas. The shelf is exploited for its oil by means of offshore drilling rigs, most of which are situated in the western gulf and in the Bay of Campeche. Another important commercial activity is fishing; major catches include red snapper, amberjack, tilefish, swordfish, and various grouper, as well as shrimp and crabs. Oysters are also harvested on a large scale from many of the bays and sounds. Other important industries along the coast include shipping, petrochemical processing and storage, military use, paper manufacture, and tourism.
The gulf's warm water temperature can feed powerful Atlantic hurricanes causing extensive human death and other destruction as happened with Hurricane Katrina in 2005. In the Atlantic, a hurricane will draw up cool water from the depths and making it less likely that further hurricanes will follow in its wake (warm water being one of the preconditions necessary for their formation). However, the Gulf is shallower; when a hurricane passes over the water temperature may drop but it soon rebounds and becomes capable of supporting another tropical storm.[31]
The Gulf is considered aseismic; however, mild tremors have been recorded throughout history (usually 5.0 or less on the Richter magnitude scale). Earthquakes may be caused by interactions between sediment loading on the sea floor and adjustment by the crust.[32]
2006 earthquake[edit]
Main article: 2006 Gulf of Mexico earthquake
On September 10, 2006, the U.S. Geological Survey National Earthquake Information Center reported that a magnitude 6.0 earthquake occurred about 250 miles (400 km) west-southwest of Anna Maria, Florida, around 10:56 AM EDT. The quake was reportedly felt from Louisiana to Florida in the Southeastern United States. There were no reports of damage or injuries.[33][34] Items were knocked from shelves and seiches were observed in swimming pools in parts of Florida.[35] The earthquake was described by the USGS as an intraplate earthquake, the largest and most widely felt recorded in the past three decades in the region.[35] According to the September 11, 2006 issue of The Tampa Tribune, earthquake tremors were last felt in Florida in 1952, recorded in Quincy, 20 miles (32 km) northwest of Tallahassee
Maritime boundary delimitation agreements[edit]
Cuba and Mexico: Exchange of notes constituting an agreement on the delimitation of the exclusive economic zone of Mexico in the sector adjacent to Cuban maritime areas (with map), of July 26, 1976.
Cuba and United States: Maritime boundary agreement between the United States of America and the Republic of Cuba, of December 16, 1977.
Mexico and United States: Treaty to resolve pending boundary differences and maintain the Rio Grande and Colorado River as the international boundary, of November 23, 1970; Treaty on maritime boundaries between the United States of America and the United Mexican States (Caribbean Sea and Pacific Ocean), of May 4, 1978, and Treaty between the Government of the United States of America and the Government of the United Mexican States on the delimitation of the continental shelf in the Western Gulf of Mexico beyond 200 nautical miles (370 km), of June 9, 2000.
On December 13, 2007, Mexico submitted information to the Commission on the Limits of the Continental Shelf (CLCS) regarding the extension of Mexico's continental shelf beyond 200 nautical miles.[36] Mexico sought an extension of its continental shelf in the Western Polygon based on international law, UNCLOS, and bilateral treaties with the United States, in accordance with Mexico's domestic legislation. On March 13, 2009, the CLCS accepted Mexico's arguments for extending its continental shelf up to 350 NM into the Western Polygon. Since this would extend Mexico's continental shelf well into territory claimed by the United States, however, Mexico and the U.S. would need to enter a bilateral agreement based on international law that delimits their respective claims.
show
Places adjacent to Gulf of Mexico
Texas United States
Louisiana • Mississippi • Alabama Florida
Mexico
Tamaulipas
Gulf of Mexico
Atlantic Ocean
Veracruz Mexico
Tabasco • Campeche • Yucatán • Quintana Roo Cuba
Caribbean
Biota[edit]
Various biota include chemosynthetic communities near cold seeps and nonchemosynthetic communities such as bacteria and other micro – benthos, meiofauna, macrofauna, and megafauna (larger organisms such as crabs, sea pens, crinoids, and demersal fish and cetaceans including endangered ones) are living in the Gulf of Mexico.[37] Recently, resident Bryde's whales within the gulf were classified as an endemic, unique subspecies and making them as one of the most endangered whales in the world.[38] The Gulf of Mexico yields more finfish, shrimp, and shellfish annually than the south and mid-Atlantic, Chesapeake, and New England areas combined.[4]
The Smithsonian Institution Gulf of Mexico holdings are expected to provide an important baseline of understanding for future scientific studies on the impact of the Deepwater Horizon oil spill.[39] In Congressional testimony, Dr. Jonathan Coddington, Associate Director of Research and Collections at the Smithsonian's National Museum of Natural History, provides a detailed overview of the Gulf collections and their sources which Museum staff have made available on an online map. The samples were collected for years by the former Minerals Management Service (renamed the Bureau of Ocean Energy Management, Regulation and Enforcement) to help predict the potential impacts of future oil/gas explorations. Since 1979, the specimens have been deposited in the national collections of the National Museum of Natural History.[40]
See also: List of invasive marine fish in the Gulf of Mexico
Pollution[edit]
Dead zone in the Gulf of Mexico
The major environmental threats to the Gulf are agricultural runoff and oil drilling.
There are frequent "red tide" algae blooms[41] that kill fish and marine mammals and cause respiratory problems in humans and some domestic animals when the blooms reach close to shore. This has especially been plaguing the southwest and southern Florida coast, from the Florida Keys to north of Pasco County, Florida.
The Gulf contains a hypoxic dead zone that runs east-west along the Texas-Louisiana coastline. In July 2008, researchers reported that between 1985 and 2008, the area roughly doubled in size and now stretches from near Galveston, Texas, to near Venice, Louisiana. It is now about 8,000 square miles (21,000 km2), nearly the record.[42] Poor agricultural practices in the northern portion of the Gulf of Mexico have led to a tremendous increase of nitrogen and phosphorus in neighboring marine ecosystems, which has resulted in algae blooms and a lack of available oxygen. Occurrences of masculinization and estrogen suppression were observed as a result. An October 2007 study of the Atlantic croaker found a disproportioned sex ratio of 61% males to 39% females in hypoxic Gulf sites. This was compared with a 52% to 48% male-female ratio found in reference sites, showing an impairment of reproductive output for fish populations inhabiting hypoxic coastal zones.[43]
There are 27,000 abandoned oil and gas wells beneath the Gulf. These have generally not been checked for potential environmental problems.[44]
Ixtoc I explosion and oil spill[edit]
Main articles: Ixtoc I and Ixtoc I oil spill
In June 1979, the Ixtoc I oil platform in the Bay of Campeche suffered a blowout leading to a catastrophic explosion, which resulted in a massive oil spill that continued for nine months before the well was finally capped. This was ranked as the largest oil spill in the Gulf of Mexico until the Deepwater Horizon oil spill in 2010.
Deepwater Horizon explosion and oil spill[edit]
Main articles: Deepwater Horizon explosion and Deepwater Horizon oil spill
On April 20, 2010, the Deepwater Horizon oil platform, located in the Mississippi Canyon about 40 miles (64 km) off the Louisiana coast, suffered a catastrophic explosion; it sank a day-and-a-half later.[45] It was in the process of being sealed with cement for temporary abandonment, to avoid environmental problems.[44] Although initial reports indicated that relatively little oil had leaked, by April 24, it was claimed by BP that approximately 1,000 barrels (160 m3) of oil per day were issuing from the wellhead, about 1-mile (1.6 km) below the surface on the ocean floor.[46] On April 29, the U.S. government revealed that approximately 5,000 barrels (790 m3) per day, five times the original estimate, were pouring into the Gulf from the wellhead.[47] The resulting oil slick quickly expanded to cover hundreds of square miles of ocean surface, posing a serious threat to marine life and adjacent coastal wetlands, and to the livelihoods of Gulf Coast shrimpers and fishermen.[48] Coast Guard Rear Adm. Sally Brice O'Hare stated that the U.S. government will be "employing booms, skimmers, chemical dispersants and controlled burns" to combat the oil spill. By May 1, 2010, the oil spill cleanup efforts were underway, but hampered by rough seas and the "tea like" consistency of the oil. Cleanup operations were resumed after conditions became favorable. On May 27, 2010, The USGS had revised the estimate of the leak from 5,000 barrels per day (790 m3/d) to 12,000–19,000 barrels per day (3,000 m3/d)[49] an increase from earlier estimates. On July 15, 2010, BP announced that the leak stopped for the first time in 88 days.
In July 2015 BP reached an $18.7bn settlement with the US government, the states of Alabama, Florida, Louisiana, Mississippi and Texas, as well as 400 local authorities. To date BP's cost for the clean-up, environmental and economic damages and penalties has reached $54bn.[50]
Minor oil spills[edit]
According to the National Response Center, the oil industry has thousands of minor accidents in the Gulf of Mexico every year.[51]
Brutus oil spill[edit]
On May 12, 2016, a release of oil from subsea infrastructure on Shell's Brutus oil rig released 2,100 barrels of oil. This leak created a visible 2 mile by 13 mile oil slick in the sea about 97 miles south of Port Fourchon, Louisiana, according to the U.S. Bureau of Safety and Environmental Enforcement.[51]
See also[edit]
Cantarell Field
Brine pool
Charlotte Harbor Estuary, Florida
Gulf Coast
Gulf of Mexico Foundation
Hypoxia
Jack 2 (a test well in the deep waters of the Gulf of Mexico)
Orca Basin
Outer Continental Shelf
Territorial evolution of the Caribbean
US Gulf of Mexico Protraction areas
Atwater Valley
East Cameron
Eugene Island
Garden Banks
Green Canyon
Keathley Canyon
Mississippi Canyon
Sigsbee Escarpment
South Marsh Island
Walker Ridge
References[edit]
Jump up ^ "Gulf of Mexico - a sea in Atlantic Ocean". www.deepseawaters.com.
Jump up ^ "Gulf of Mexico". Geographic Names Information System. January 1, 2000. Retrieved July 8, 2010.
^ Jump up to: a b c Huerta, A.D., and D.L. Harry (2012) Wilson cycles, tectonic inheritance, and rifting of the North American Gulf of Mexico continental margin. Geosphere. 8(1):GES00725.1, first published on March 6, 2012, doi:10.1130/GES00725.1
^ Jump up to: a b "General Facts about the Gulf of Mexico". epa.gov. Retrieved December 27, 2006.
Jump up ^ "Gulf of Mexico Fact Sheet". U.S. Energy Information Administration. Retrieved 26 March 2018.
Jump up ^ "Limits of Oceans and Seas, 3rd edition" (PDF). International Hydrographic Organization. 1953. Retrieved February 7, 2010.
^ Jump up to: a b c d Salvador, A. (1991) Origin and development of the Gulf of Mexico basin, in A. Salvador, ed., p. 389-444, The Gulf of Mexico Basin: The Geology of North America, v. J., Geological Society of America, Boulder, Colorado.
^ Jump up to: a b c Stern, R.J., and W.R. Dickinson (2010) The Gulf of Mexico is a Jurassic backarc basin. Geosphere. 6(6):739–754.
Jump up ^ Van Arsdale, R. B. (2009) Adventures Through Deep Time: The Central Mississippi River Valley and Its Earthquakes. Special Paper no. 455, Geological Society of America, Boulder, Colorado. 107 pp.
Jump up ^ Cox, R. T., and R. B. Van Arsdale (2002) The Mississippi Embayment, North America: a first order continental structure generated by the Cretaceous superplume mantle event. Journal of Geodynamics. 34:163–176.
Jump up ^ Zell,P., Stinnesbeck, W., Beckmann,S., (2016). "Late Jurassic aptychi from the La Caja Formation of northeastern Mexico" (PDF). Boletín de la Sociedad Geológica Mexicana. 68: 515–536. CS1 maint: Multiple names: authors list (link)
Jump up ^ Buffler, R. T., 1991, Early Evolution of the Gulf of Mexico Basin, in D. Goldthwaite, ed., pp. 1–15, Introduction to Central Gulf Coast Geology, New Orleans Geological Society, New Orleans, Louisiana.
^ Jump up to: a b c d Galloway, W. E., 2008, Depositional evolution of the Gulf of Mexico sedimentary basin. in K.J. Hsu, ed., pp. 505–549, The Sedimentary Basins of the United States and Canada, Sedimentary Basins of the World. v. 5, Elsevier, The Netherlands.
^ Jump up to: a b Sawyer, D. S., R. T. Buffler, and R. H. Pilger, Jr., 1991, The crust under the Gulf of Mexico basin, in A. Salvador, ed., pp. 53–72, The Gulf of Mexico Basin: The Geology of North America, v. J., Geological Society of America, Boulder, Colorado.
^ Jump up to: a b "gulfbase.org". Archived from the original on December 10, 2009.
Jump up ^ Stanton, M. S., 2002, Is the Gulf's Origin Heaven Sent? AAPG Explorer (Dec. 2002) American Association of Petroleum Geologists. Tulsa Oklahoma.
Jump up ^ Mickus, K., R. J. Stern2, G. R. Keller, and E. Y. Anthony (2009) Potential field evidence for a volcanic rifted margin along the Texas Gulf Coast. Journal of Geology. v. 37, p. 387-390.
Jump up ^ Kevin Knight (2009). "Pierre Le Moyne, Sieur d'Iberville". newadvent.org. Retrieved May 8, 2009.
Jump up ^ "FPAN Home". Florida Public Archaeology.
Jump up ^ "Mystery Mardi Gras Shipwreck". Nautilus Productions.
Jump up ^ "Mystery Mardi Gras Shipwreck Documentary". MUA.
Jump up ^ Helgason, Guðmundur. "Robert E. Lee". German U-boats of World War II – uboat.net. Retrieved August 1, 2015.
Jump up ^ Helgason, Guðmundur. "U-166". German U-boats of World War II – uboat.net. Retrieved July 31, 2015.
Jump up ^ "Historic Shipwrecks in the Gulf of Mexico". gomr.mms.gov. Archived from the original on October 17, 2008. Retrieved February 22, 2010.
Jump up ^ Daniel J. Warren, Robert A. Church. "The Discovery of U – 166 : Rewriting History with New Technology" (PDF). Offshore Technology Conference. Retrieved July 31, 2015.
Jump up ^ "Gulf of Mexico Watershed". EPA.gov. Retrieved December 6, 2010.
Jump up ^ National Geophysical Data Center, 1999. Global Land One-kilometer Base Elevation (GLOBE) v.1. Hastings, D. and P.K. Dunbar. National Geophysical Data Center, NOAA. doi:10.7289/V52R3PMS [access date: March 16, 2015]
Jump up ^ Amante, C. and B.W. Eakins, 2009. ETOPO1 1 Arc-Minute Global Relief Model: Procedures, Data Sources and Analysis. NOAA Technical Memorandum NESDIS NGDC-24. National Geophysical Data Center, NOAA. doi:10.7289/V5C8276M [access date: March 18, 2015].
Jump up ^ "National Water Program Guidance: FY 2005". epa.gov. Archived from the original on October 2, 2006. Retrieved January 21, 2007.
Jump up ^ "Gulf of Mexico". Handbook of Texas Online. Texas State Historical Association. Retrieved June 26, 2010.
Jump up ^ "Warm Waters Provide Fuel for Potential Storms". NASA Earth Observatory. Archived from the original on October 1, 2006. Retrieved May 5, 2006.
Jump up ^ "Earthquakes in the Gulf of Mexico". Retrieved December 27, 2006.
Jump up ^ "Central Florida Feels Quake". Archived from the original on August 28, 2007. Retrieved December 27, 2006.
Jump up ^ "6.0 Magnitude Earthquake In Gulf Of Mexico Shakes Southeast". www.observernews.net.
^ Jump up to: a b United States Geological Survey, September 11, 2006 Archived October 14, 2006, at the Wayback Machine.
Jump up ^ "Mexico's Attempt to Extend its Continental Shelf Beyond 200 Nautical Miles Serves as a Model for the International Community, Mexican Law Review, Volume V, Number 2, Jan.– June 2013" (PDF).
Jump up ^ Minerals Management Service Gulf of Mexico OCS Region (November 2006). "Gulf of Mexico OCS Oil and Gas Lease Sales: 2007–2012. Western Planning Area Sales 204, 207, 210, 215, and 218. Central Planning Area Sales 205, 206, 208, 213, 216, and 222. Draft Environmental Impact Statement. Volume I: Chapters 1–8 and Appendices". U.S. Department of the Interior, Minerals Management Service, Gulf of Mexico OCS Region, New Orleans. page 3-27–3-34 PDF Archived March 26, 2009, at the Wayback Machine..
Jump up ^ Rosel E. P.. Corkeron P.. Engleby L.. Epperson D.. Mullin D. K.. Soldevilla S. M.. Taylor L. B.. 2016. STATUS REVIEW OF BRYDE’S WHALES (BALAENOPTERA EDENI) IN THE GULF OF MEXICO UNDER THE ENDANGERED SPECIES ACT. NOAA Technical Memorandum NMFS-SEFSC-692
Jump up ^ Zongker, Brett (July 21, 2010). "Smithsonian Holdings to Aid Researchers in the Gulf". Associated Press. Archived from the original on July 24, 2010. Retrieved July 29, 2010.
Jump up ^ Coddington, Jonathan (June 15, 2010). "Testimony to the Subcommittee on Insular Affairs, Oceans and Wildlife; Committee on Natural Resources; U.S. House of Representatives" (PDF). [Smithsonian Ocean Portal]. Retrieved July 29, 2010.
Jump up ^ "The Gulf of Mexico Dead Zone and Red Tides". Retrieved December 27, 2006.
Jump up ^ Joel Achenbach, "A 'Dead Zone' in The Gulf of Mexico: Scientists Say Area That Cannot Support Some Marine Life Is Near Record Size", Washington Post, July 31, 2008
Jump up ^ Thomas, Peter; Md Saydur Rahman (2012). "Extensive Reproductive Disruption, Ovarian Masculinization and Aromatase Suppression in Atlantic Croaker in the Northern Gulf of Mexico Hypoxic Zone". Proceedings of the Royal Society B: Biological Sciences. 279 (1726): 28–38. doi:10.1098/rspb.2011.0529. PMC 3223642  .
^ Jump up to: a b Donn, Jeff (July 7, 2010). "Gulf home to 27,000 abandoned wells". Burlington, Vermont: Burlington Free Press. pp. 1A.
Jump up ^ "Burning oil rig sinks, setting stage for spill; 11 still missing", by Kevin McGill and Holbrook Mohr (Associated Press), Boston Globe, April 23, 2010
Jump up ^ "Well from sunken rig leaking oil", by Cain Burdeau (Associated Press), Boston Globe, April 25, 2010
Jump up ^ Robertson, Campbell; Kaufman, Leslie (April 28, 2010). "Size of Spill in Gulf of Mexico Is Larger Than Thought". The New York Times.
Jump up ^ "Race to plug leaking oil well off La. spurs new tactics", by Cain Burdeau (Associated Press), Boston Globe, April 27, 2010
Jump up ^ "Gulf Oil Spill Worst in U.S. History; Drilling Postponed", by Marianne Lavelle, National Geographic, May 27, 2010
Jump up ^ Ed Crooks, Christopher Adams,. "BP: Into uncharted waters". ft.com. Retrieved August 10, 2015.
^ Jump up to: a b Chow, Lorraine. "Shell Oil Spill Dumps Nearly 90,000 Gallons of Crude Into Gulf". EcoWatch. Retrieved June 6, 2016.
External links[edit]
Wikimedia Commons has media related to Gulf of Mexico.
Resource Database for Gulf of Mexico Research
Gulf of Mexico Integrated Science
Mystery Mardi Gras Shipwreck
"Mexico, Gulf of". Encyclopædia Britannica (11th ed.). 1911.
"Mexico, Gulf of". Collier's New Encyclopedia. 1921.
Bathymetry of the Northern Gulf of Mexico and the Atlantic Ocean East of Florida United States Geological Survey
The Present State of the West-Indies: Containing an Accurate Description of What Parts Are Possessed by the Several Powers in Europe written by Thomas Kitchin, 1778, in which Kitchin discusses, in chapter 1, why the Gulf should have been called the "West Indian Sea."
BP Oil Spill, NPR
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