Also, geothermal, often found in an area known as Hot Spots is the area with the flow, or spread the spread of the heat of the earth's surface up to under ground surface than usual. And the temperature change with depth (Geothermal Gradient).1.5-5 equal, because in the crust has such movement. Cause of cracks of the rock, usually the size of the crack surface are large, and gradually smaller when the ball deep down under the surface. And when the rain in the area.Down under the earth's surface. Along such cracks, water will accumulate, and the heat from the rock. With hot water and steam heat until the water become and will try to insert along cracks instructions accordingly stone surface.Hot spring, hot steam, pond mud boil.
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