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►Geothermal energy:

The word geothermal comes from the Greek words geo (earth) and thermal (heat). So, geothermal energy is heat from within the earth. We can use the steam and hot water produced inside the earth to heat buildings or generate electricity. Geothermal energy is a renewable energy source because the water is replenished by rainfall and the heat is continuously produced inside the earth.

Geothermal energy is generated in the earth's core, about 4,000 miles below the surface. Temperatures hotter than the sun's surface are continuously produced inside the earth by the slow decay of radioactive particles, a process that happens in all rocks.

Probably the most uncontrollable energy source that we have at our partial disposal is the tremendous energy beneath the earth's crust. The center of our planet is composed of molten Iron core which accounts for our magnetic field that emanates from the earth's core. This enormous source of thermal energy comes bubbling up to the surface in the form of hot water springs or the super heated steam geysers that erupt gently in clockwork fashion. The eruption of volcanoes is one source that we have not been using, the eruption of Mount St.
Helens nature erupted with the power of hundreds of thermonuclear devices going off simultaneously. One third of the top of that mountain was reduced to ash in a matter of seconds. New technologies are needed to tap into this awesome power locked deep within the earth's surface.