Question

why the earth's interior is hot? ​

Answer 1

Answer:

due to lava and magma in the core of the earth

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;

(3) heat from the decay of radioactive elements.