Deep sea vents -- where hot minerals and gases (including S, H, O, and C) are injected directly into the water -- are another place where thermophilic organisms thrive.

http://www.atp.nist.gov/eao/sp950-2/chapt3-2.htm

Some of these chemotrophic organisms are methanogenic (CO2 + 4H2 --> CH4 + 2H2O) or sulfur reducing (S + H2 --> H2S) as they produce energy.

Greek scholars: troph means "nourishment."

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