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geothermal energy - National Geographic Education
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education.nationalgeographic.com/...geothermal-energy
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hardingmar00
on 24 Sep 13
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Geothermal energy is heat that is generated within the Earth.
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File:Giant photovoltaic array.jpg - Wikipedia, the free
encyclopedia
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en.wikipedia.org/...e:Giant_photovoltaic_array.jpg
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