Related to heat that comes from inside the Earth, often used for energy or heating.
From Greek *gē* “earth” + *thermos* “hot.” The term was formed in modern scientific language to describe natural heat sources like hot springs and volcanic areas. It later became common in discussions of renewable energy.
Geothermal energy taps into the fact that Earth is basically a giant slow-cooling ball of heat. In some places you can heat homes or generate electricity just by drilling down and letting the planet’s own warmth do the work.
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