Answer the following question given this paragraph: Heat below Earth's surfacecalled geothermal energy can be used to produce electricity. A power plant pumps water underground where it is heated. Then it pumps the water back to the plant and uses its thermal energy to generate electricity. On a small scale, geothermal energy can be used to heat homes. Installing a geothermal system can be very costly, however, because of the need to drill through underground rocks. Q: What do you call the heat below earth's surface that can be used to produce electricity? A:
Possible answers: 1). inert energy. 2). renewable energy. 3). natural energy. 4). geothermal energy.
4).