GEOTHERMAL HEAT

Geothermal heat—refer to the heat energy that is generated and stored within the Earth. Geothermal heat is primary generated by the natural decay of radioactive isotops in the Earth's core and mantle as well as remains there from original residual heat from Earth's formation [1]. When geothermal heat harnessed and converted into usable energy it is commonly known as geothermal energy. For more information see Geothermal Heat Sources and Reserves.