Limits of microbial life in an undersea volcano: Third of Earth’s organisms live in rock and sediments

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By some estimates, a third of the Earth's organisms by mass live in our planet's rocks and sediments, yet their lives and ecology are almost a complete mystery. Microbiologists have just revealed the first detailed data about a group of methane-exhaling microbes that live deep in the cracks of hot undersea volcanoes.

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