A Starving Majority Deep Beneath the Seafloor

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Science  10 Nov 2006:
Vol. 314, Issue 5801, pp. 932-934
DOI: 10.1126/science.1133796

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The rocks and sediments beneath the seafloor may harbor most of Earth's microorganisms. Molecular approaches are beginning to provide clues regarding the energy sources fueling their metabolic activity.