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Alteration of Oceanic Volcanic Glass: Textural Evidence of Microbial Activity

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Science  14 Aug 1998:
Vol. 281, Issue 5379, pp. 978-980
DOI: 10.1126/science.281.5379.978

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Abstract

The subsurface biosphere may constitute as much as 50 percent of Earth's biomass. Direct and indirect evidence suggests that an extensive biosphere exists in the rocks below the sea floor. This survey of basalts of the Atlantic, Pacific, and Indian Oceans supports the hypothesis that bacteria have colonized much of the upper oceanic crust, which has a volume estimated at 1018 cubic meters. Although this is the largest habitat on Earth, its low abundance of bacteria constitutes much less than 1 percent of Earth's biomass.

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