Answer the following question given this paragraph: 

Heat below Earth’s surface—called 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?

 Choices:

- inert energy

- renewable energy

- natural energy

- geothermal energy

A:
geothermal energy
