There have been at least 13 news worthy industrial oil spills in 2010, and many minor spills. See related questions:
About 125 known major oil spills.
BP has had 2 major oil spills: The BP Alaskan oil spill of 2006, and the 2010 Gulf of Mexico Oil spill of 2010.
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There have been thousands of oil spills in history, ever since oil was first discovered.
April the 20th 2010
There have been many oil spills that have leaked into water sources. See related questions.
The US has had many oil spills in its history including, most recently, the 2010 April 20 BP oil spill in the Gulf of Mexico off of Louisiana.For other spills, please see related questions.
There have been many oil spills in history; see related questions: The BP Gulf of Mexico/Macondo Blowout/Deepwater Horizon oil spill well blow out and subsequent spill began on April 20, 2010.
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It can definitely contribute to oil spills.
Many things, including wars, ship wrecks, and wells exploding are some of the few causes of oil spills.
oil spills happen because people are careless and and instead of emptying there tank they dump it in the ocean and cars driving on beaches.