What is the source of thermal energy for Earth's mantle? A Earth's core
B. global warming
C. mantle downwelling
D. radiation from the sun

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.

Explanation:

so it should be D

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