| http://www.w3.org/ns/prov#value | - The blowout preventer typically activates after a blast or other event to cut off any oil that may spill.The cause of the blast remains undetermined, and Salvin said we are not ruling anything out.Crews have had little success stemming the flow from the ruptured well on the sea floor off Louisiana or removing oil from the surface by skimming it, burning it or dispersing it with chemicals.
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