Geothermal Energy.Geothermal means earth heat.This energy captures the heat energy under the Earth.Hot rock under the ground help to heat water to produce steam.If holes are dug in this area of the ground,then the steam shoots up and is purified and used to drive turbines,which in turn gives power to electric generators.The advantages of this type of energy is that there are no harmful by-products,it is self-sufficient once the geothermal plant is built,and the plant are generally small so there is no negetive visual effect on the area surrounding the plant