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Explain how redioactive decay has always warmed the Earth from the inside and how nuclear fusion has always warmed the Earth from the outside.

  • Physics -

    The slow radioactive decay of elements like Uranium that are still present in the earths crust generates heat from within. The fusion of hydrogen into helium in the sun, through a series of steps that also involve carbon and oxygen transmutation, provides the energy that keeps the surface of the earth warm

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