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A geothermal power plant uses geothermal activity to generate power. This type of natural energy production is extremely environmentally friendly and used in many geothermal hot spots around the globe.
To harness the energy, deep holes are drilled into the earth (much like when drilling for oil) until a significant geothermal hot spot is found.
When the heat source has been discovered, a pipe is attached deep down inside the hole which allows hot steam from deep within the earths crust to rise up to the surface.
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