Answer the following question: Fact 1: Energy is used for heating a building by a heating system. Fact 2: Geothermal energy is used for heating and cooling systems. Given the two facts above, what is a way to heat a building?

Select from:
A). sound.
B). Movement of an air mass.
C). burning coal.
D). static electricity.
E). In the winter.
F). potential energy.
G). by indirect light.
H). geothermal energy.
Answer:
H).