Geothermal energy refers to the heat that dissipates from the core of the earth, in the form of active volcanoes, hot water springs, and natural geysers. Like all forms of heat, the geothermal energy can also be converted into electricity. Several countries have developed geothermal power plants. The energy however is not tapped from active volcanoes or such dangerous areas. Rather wells similar to petroleum wells are drilled, and hot ground water is pumped out onto the generators to produce electricity. In places without groundwater, surface water is sprayed onto the hot rocks and the heated water, and steam is later pumped out. Geothermal is a clean and renewable energy source.
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