Geothermal energy is energy generated by geologic sources of heat and can be considered a form of renewable energy, when measured in the short term. It is based on the production of natural heat of the earth (geothermal) fed by the thermal energy released in the processes of nuclear decay of radioactive elements like uranium, thorium and potassium, contained naturally in the earth.
Read More: http://hubpages.com/hub/How-Geothermal-Energy-Works
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