Geothermal

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 Geothermal energy comes from the heat in the Earth's core. The heat is used to evaporate a liquid which goes through turbines as it rises, generating electricity. The geological locations where the geothermal heat is easily available are limited and subject to change, but geothermal is a free and environmentally sound source of electricity. Geothermal can also be used for home heating, in which pipes are put into the ground which circulate a liquid that captures heat or cold from the ground and distributes it through the home. Geothermal heating systems for buildings are becoming popular.

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