The origin of most internal energy in Earth's interior is

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The origin of most internal energy in Earth's interior is radioactivity. This is due to the decay of isotopes of elements such as uranium, thorium, and potassium, which produce heat energy as a byproduct. This heat is then transported through the mantle and crust by convection, ultimately leading to plate tectonic activity, volcanoes, and other geological phenomena. The Sun does contribute to some of Earth's energy, but it is a much smaller amount compared to that of radioactivity. Volcanoes are a result of plate tectonics and the movement of magma within the Earth's crust, which is fueled by the heat generated by radioactivity.

The Origin of Most Internal Energy in Earth's Interior Is