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i read up on that recently and IIRC the heat that comes out of earth's interior is about 0.03% of the total power we get on the surface of earth, the vast majority is from sunlight.

and earth's interior heat is about half-and-half from primordial heat (from when earth was formed) and from decay of primordial radionuclids and their decay products (basically uranium and thorium decaying)

this post was submitted on 24 Jan 2026
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