Question

earths internal heat originated from ?

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Answer 1

Answer:

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The flow of heat from Earth's interior to the surface is estimated at 47±2 terawatts (TW)and comes from two main sources in roughly equal amounts: the radiogenic heat produced by the radioactive decay of isotopes in the mantle and crust, and the primordial heat left over from the formation of Earth.

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Answer 2

Answer:

the radiogenic heat produced by the radio active decay of isotopes in the mantle and crust and the primordial heat left over from the formation of earth.