BP Oil on Gulf Floor

The report leaves unanswered many questions about the spill’s environmental impact that scientists are likely to be researching—and BP and the government are likely to be fighting over—for years.

For instance, officials sprayed some 1.8 million gallons of chemical dispersants on the oil to break it up and prevent it from washing ashore. In some sediment, tests found a chemical contained in dispersant, but its environmental impact is unknown, the report said.

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