Answer:
The radioactive isotopes uranium-235 (235U), uranium-238 (238U), potassium-40 (40K), and thorium-232 (232Th) in Earth's mantle are the primary source. ... Heat contributed by radioactivity is now roughly a quarter what it was when Earth formed.
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Answer:
The radioactive isotopes uranium-235 (235U), uranium-238 (238U), potassium-40 (40K), and thorium-232 (232Th) in Earth's mantle are the primary source. ... Heat contributed by radioactivity is now roughly a quarter what it was when Earth formed.