The interior of the Earth is hot for several
reasons and much of the heat is left over from the
formation of the earth 4.6 billion years ago. The earth formed out of a spinning mass of gases and meteorites that were drawn together by the force of gravity. As they collided together into the earth,they produced a tremendous amount of heat.
The earth has cooled quite a bit, but it is still
as much as 4300C (7770F) in the middle. The
material the earth is made of also contains many
radioactive elements. As these elements decay, they release more energy. So the interior of the earth is hot because of gravitational energy, impact energy, and radioactive energy.
All the best.
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