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The top documents tagged [groundgeothermal energy]
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groundgeothermal energy
Volcanoes and Earthquakes. What is a volcano? Weak spot in crust where molten material (magma) comes to the surface.
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Volcanoes and Earthquakes
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Alternative/Renewable/ Sustainable Energy. Alternative Energies Clean Fuels ◦ Create less pollution ◦ Alcohols, electricity, natural gas & propane Clean.
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