At the bottom of the ocean, there are small underwater volcanoes spewing scalding hot water, gases, and chemicals like methane and ammonia. They're called hydrothermal vents.
Source: tatoeba (5391070)
Hydrothermal
Synonyms for "hydrothermal"
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If you like astronomy, maybe read the paper "Ongoing hydrothermal activities within Enceladus."
Source: tatoeba (10685316)
The scientists say the existence of these large complex molecules, along with hydrothermal activity, supports a theory that a massive liquid water ocean, below the icy crust of Enceladus, may provide a habitable environment for life.
Source: tatoeba (12356587)