The heat from the
earth's own molten core can be converted into electricity. This core consists
primarily of extremely high temperature liquid rock known as magma. This
"geothermal" heat circulates within the rock or is transferred to underground
reservoirs of water, which also circulate under the earth's crust. Because
of the near limitless ability of the earth to produce magma, and the continuous
transfer of heat between subsurface rock and water, geothermal energy
is considered a renewable resource.
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