| http://www.w3.org/ns/prov#value | - They said they found methane concentrations up to 10,000 times higher than normal, and oxygen levels depleted by 40 percent or more.The scientists found that some parts of the plume had oxygen concentrations just shy of the level that tips ocean waters into the category of dead zone ??? a region uninhabitable to fish, crabs, shrimp and other marine creatures.Kessler has encountered similar findi
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