Geothermal energy, mean thermal energy from a heat source of natural right way under the earth's surface Usually, the temperature will increase with depth below the earth's surface And when the deeper down to within the center of the earth There will be a tremendous energy source The heat under the earth pressure is very high Tried to push out of the earth's surface track is different Geothermal resources Often found in an area known as hot spot (hot spots) by the area will have the change of temperature along the depth. The flow Or the spread of heat from under the earth surface up to the surface (geothermal gradient) than usual about 1.5-5 imaginable