It’s cold in the depths of the world’s oceans; most of the seafloor is at a chilly 4°C. Not so the seafloor of Guaymas Basin in the Gulf of California. Here, tectonic plates drift apart and heat from Earth’s interior can rise up—so far up that it bakes large areas of the seafloor sediments, turning buried organic matter into methane and other energy-rich compounds.
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Source: Phys.org