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Geochemist Susan Humphris shows Dan Stuermer and Vinod Khosla a rock sample collected by Alvin. The thin, black, glassy surface forms when lava erupts on the seafloor. (Photo by Amy Nevala)


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Geochemist Susan Humphris shows Dan Stuermer and Vinod Khosla a rock sample collected by Alvin. The thin, black, glassy surface forms when lava erupts on the seafloor. (Photo by Amy Nevala)

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