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DNRE-Kalamazoo-RiverMichigan Department of Natural Resources, via Flickr

Oil in the Kalamazoo River on July 28, 2010, three days after an Enbridge pipeline burst, causing the worst inland oil spill in U.S. history. The spill was particularly difficult to clean up because some of the oil sank.

By: Kate Golden

Oil that sinks is hard to clean up. More