Geothermal is related to energy and may refer to: * Geothermal energy, useful energy generated and stored in the Earth * Geothermal activity, the range of natural phenomena at or near the surface, associated with release of the Earth's internal heat. * Earth's internal heat budget, accounting of the flows of energy at and below the surface of the planet's crust * Geothermal gradient, down which heat flows within the Earth * Geothermal exploration, the search for commercially usable geothermal energy

Uses of geothermal energy

* Earth sheltering, constructing a building into a hill side or Earth berm to reduce heating and cooling requirements * Earth cooling tubes, using ambient Earth temperature to cool and dehumidify air * Geothermal desalination, the production of fresh water using heat energy extracted from underground rocks * Geothermal heating, methods of heating and cooling a building using underground heat * Geothermal power, electricity generated from naturally occurring geological heat sources * Ground source heat pump, a device used for heating and cooling using the earth as a heat reservoir ** Direct exchange geothermal heat pump, a method of heating and cooling with the energy of the earth using direct exchange of heat * Hot dry rock geothermal energy, heating water in hot deep rock {{disambig