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Geothermal energy
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Thermal energy generated and stored in the Earth
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Geothermal energy is thermal energy extracted from the Earth's crust. It combines energy from the formation of the planet and from radioactive decay. Geothermal energy has been exploited as a source of heat and/or electric power for millennia.

Instance of
Academic major
Renewable energy
Subclass of
Renewable energy
Alternative energy
Physical quantity
Natural resource
Sustainable energy
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