Geothermal Energy

Geothermal Energy is heat energy generated and stored in the Earth. Thermal energy is the energy that determines the temperature of matter. The adjective geothermal originates from the Greek roots γη (ge), meaning earth, and θερμος (thermos), meaning hot. The geothermal energy of the Earth's crust originates from the original formation of the planet and from radioactive decay of materials (in currently uncertain but possibly roughly equal proportions). The geothermal gradient, which is the difference in temperature between the core of the planet and its surface, drives a continuous conduction of thermal energy in the form of heat from the core to the surface. Example:

Palinpinon Geothermal Energy

Nesjavellir Geothermal Power Station in Iceland