Sources of heat in the Earth's core:
Mon Jun 18, 2018 12:41pm

1. Radioactive decay

2. Heat of solidification released as the inside of the liquid core solidifies and the solid core grows.

3. Referring to #2 above, as the core solidifies, the liquid core gets a tiny bit smaller due to the rearrangement of atoms from liquid disorder to solid order. It is not known at this time what the coefficient of contraction due solidification is under the temperature and pressure prevailing at the solid-liquid core boundary. However, I will suppose that it is on the order of 0.0001% or so. In such a case, the entire Earth overlying the outer core will descend (fall) by perhaps a meter in a billion years. The gravitational energy released by this falling and compression of the overlying liquid core + mantle + crust is sufficient to account for the energy being released by the interior of the Earth.


    • Are you suggestingGOG, Tue Jun 19 6:41am
      the earth is shrinking from prune into a raisin? How will the plate tectonics operate in such a scenario? And how does this impact the ocean waters?
      • But a reduction of diameter of one or a few meters would not have much effect other than producing huge quantities of heat . I am talking in reduction of the Earth's radius by less than one part per... more
        • Thank you.G🤔G, Fri Jul 6 7:03pm
          You do know about the concept that Pangea began with a much smaller earth. The earth has expanded so the adherents say.
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