BP oil spill

Associated Press
U.S. Attorney General Eric Holder, center, arrives at a press conference followed by Acting Associate Attorney General Tony West, far left, and lead by Assistant Attorney General for the Criminal Division Lanny A. Breuer, top right, to speak about the 2010 Gulf Oil Spill settlement and criminal penalties in New Orleans, La. Thursday, Nov. 15, 2012.  Holder said the settlement and indictments aren't the end of federal authorities' efforts and that the criminal investigation is continuing. Holder says much of the money BP has agreed to pay will be used to restore the environment in the Gulf. (AP Photo/Matthew Hinton)

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The BP oil spill left an oily "bathub ring" on the sea floor that's about the size of Rhode Island, new research shows.

The study by David Valentine, the chief scientist on the federal damage assessment research ships, estimates that about 10 million gallons of oil coagulated on the floor of the Gulf of Mexico around the damaged Deepwater Horizons oil rig. (AP)

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