Geothermal Energy Geothermal meaning earth's thermal energy that has been around since the beginning of earth. Except the outer cold layer of earth, the underneath layers has enormous heat that reveal in any break of crust, as seen in volcanoes. Lava is a melted hot earth that flow from a volcano. Temperature under ground rises about 3 degree Celsius per 100 meter, so in a depth of 10.000 feet, we expect a temperature for boiling water. Geysers are a form of hot springs that pour out the water and steam intermittently. This is as a result of reaching the surface water to the deep internal earth cracks. Such places are spread all over the world; people using them such places are spread all over the world, people using them for rest and relaxation for centuries. Swimming pools and health spas maybe considered just fun and entertaining, but there much more usages for hot water; for instance, they could be pipelined to far a way buildings and communities for heating purposes. In a better usage, California state uses geothermal energy for producing electricity. This kind of usage is limited to the site with a major volume of hot water and steam.  The main spots are: - the Geysers area north of San Francisco - In the northwest corner of the state near Lassen Volcanic National Park - In the Mammoth Lakes area-the site of a huge ancient volcano - In the Coco Hot Springs area in Inyo County. - In the Imperial Valley in Southern California.   Using for generating electricity, needs holes be drilled under ground, taking out the mixture of water and steam through pipes. This way power plant does not need to any boiler installation as seen in fossil fueled kind to produce hot steam for driving turbines. In a turbine, blades spin by the hot pressured spin causing the shaft connected to a generator turn accordingly purposes. Cooled water would be pumped back to the originated place for a reheating cycle under ground. The electricity generated in such a way after getting to higher voltages in transformer are transmitted over the power lines to the consuming destination. Two million people in the world rely to this kind of energy.    Geothermal/Ground source pumps Upper layer of earth close to surface has a stable not very hot temperature. In an interesting finding all over the earth, temperature of 10 feet depth is just around 10 to 16 degree C. so in a hot summer you may find a pleasant cool environment in your house basement. This way the pipes buried under ground, give an almost constant temperature to flowed water inside them. Using such a piping network, a natural heat exchanger is available for any purpose needing such a system.