In February and March of 1977, the small deep-sea-diving submarine Alvin descended to a depth of 2.6 kilometers along the East Pacific Rise. This region, northeast of the Galapagos Islands, was known to be a center of sea floor spreading. A research ship had drawn a camera over the area the previous year, confirming the existence of a series of cracks in the ocean floor that appeared to be volcanically active. But the occupants of Alvin saw much more.
KeywordsIgneous Rock Chemical Energy Hydrogen Sulfide Ocean Floor Methane Hydrate
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