The Geothermal is another type of renewable energy, it is an energy that generates electricity without polluting the environment.
It is obtained by heat within the Earth: The Earth is composed of large plates where we can find the magma( magma is the name given to the rock that lies inside the Earth and when expelled by a volcano, give raises the lava).
There are areas within the land where the forced penetration of molten rock magma, has a very high temperature, ideal for generating geothermal power plants in power generation.
The geysers are found in few places on Earth, practically 1000 in the entire planet , half of them are located in Yellowstone National Park,California, US.
The procedure of formation of geysers's underground water is made through the cracks found in the groundwater within the Earth, and in contact with rocks and volcanic lava that warms water to form such a pressure that the water goes into boiling. The generated steam forces water up to Earth in a violent form of jet. These jets can reach up to 80m high and temperatures up to 100°C.
This phenomenon usually has an unpleasant odor and corrosion can sometimes be harmful to humans.
This video explains more about the geysers found in Yellowstone Park:
http://www.youtube.com/watch?v=eEsRdstaduw
For more information and curiosities about natural Phenomena join us in Crazygreen community in orkut http://www.orkut.com.br/Main#Community?cmm=94563337
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