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ClifordK, I am not sure how - if at all - your primordial heat differs from Damocles' "Residual heat from gravitational collapse when earth first formed." Both of you have also missed certain pressure related phase changes which are exothermic. I would strenghten the comments about tectonics, eorions, recylced minerals etc. The Earth is as it is on the surface because of plate tectonics. Without them carbon dioxide would not be recycled, the carbon reservoir for organisms would be massively reduced and temperature would fall as CO2 atmospheric content fell. The mountains would all be eroded in the sea, leaving a water planet. On the plus side, the sun will have burnt us to a crisp before those changes can happen.
In 1862, the physicist William Thomson (who later became Lord Kelvin) of Glasgow published calculations that fixed the age of Earth at between 20 million and 400 million years. He assumed that Earth had formed as a completely molten object, and determined the amount of time it would take for the near-surface to cool to its present temperature. His calculations did not account for heat produced via radioactive decay (a process then unknown to science) or convection inside the Earth, which allows more heat to escape from the interior to warm rocks near the surface
Firstly, I also did not see either how primordial heat differed from my "gravitational collapse" (it did not worry me greatly though).