FILE - In this Sept. 14, 2011 file photo, seashells and tar balls are washed up along Gulf Islands National Sea Shore near Pensacola Beach, Fla. Tar balls washed onto Gulf of Mexico beaches by Tropical Storm Lee earlier this month show that oil left over from last year's BP spill isn't breaking down as quickly as some scientists thought it would, university researchers said Tuesday. (AP Photo/Melissa R. Nelson, File)
Read the article: BP oil not degrading on Gulf floor, study says
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