Question

1. How did the layers of Earth arise? Where did the energy that is flowing as heat come from?

Answer 1

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.

Step-by-step explanation:

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