How Do Geothermal Power Plants Work

How do geothermal power plants work?

A) They actively move heat from underground into an overlying structure in order to remove or add heat to the structure.
B) They utilize steam released from hydrothermal reservoirs to spin turbines and produce electricity.
C) They use the heat from hot rocks located in earthquake zones to heat coal.
D) They use heat from volcanic eruptions to boil water and create steam that can power a turbine.
E) They funnel hot steam into people's homes so that it can be used as a heat source.