The Associated Press
A worker walks past a fountain of sand from a dredge as it is pumped onto East Grand Terre Island, La. to provide a barrier against the Deepwater Horizon oil spill Tuesday.
Texas A&M oceanographers say they expect the 3,800-square-mile "dead zone" in the Gulf of Mexico to expand because of floodwaters flowing from the Mississippi River.
The zone is now the size of Rhode Island and Delaware combined. It's where the Gulf waters off the southeastern Louisiana and Mississippi coasts contain low oxygen levels, often leading to die-offs of marine life.
AUM oceanography professor Steve DiMarcosays that the biggest areas of low oxygen content remain off the Louisiana coast. Scientists with the
Louisiana Universities Martine Consortium predict the dead zone to expand to more than 9,400 square miles this year.