geothermal is incorrectly written, and should be written as "geothermal" being its meaning:Singular feminine adjective of geothermal energy, which etymologically means " the heat of the Earth " GE ges: land and thermon thermou: heat. It is a branch of Geophysics which studies the internal thermal phenomena of planet Earth. Also called thus the industrial techniques to use this heat, which comes mostly through the water, to transform it into energy. The set of these thermal phenomena internal to the Earth are also called geothermal energy
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