Question 1:

What is the primary source of heat for Earth's interior?

Question 2:

Which layer of the Earth is responsible for most of the geothermal energy?

Question 3:

What is the term for the transfer of heat through the movement of fluid or gas?

Question 4:

Which of the following is a potential application of geothermal energy?

Question 5:

What is the average geothermal gradient in the Earth's crust?