Question

What are the 3 main sources of heat on Earth?

Answer 1

Answer:

1. Sun

2. Coal

3. petroleum

Answer 2

Explanation:

There are three main sources of heat in the deep earth: (1) heat from when the planet formed and accreted, which has not yet been lost; (2) frictional heating, caused by denser core material sinking to the center of the planet; and (3) heat from the decay of radioactive elements.