[javadog]

I'd really like to know how they calculated the total heat of the earth and measured its changes.

I'd also like to know how much heat migrates from the interior of the earth to the surface. It is often assumed that the only source of temperature gain at the surface is related to solar activity but on a theoretical level, that cannot be true.

Things like that cannot be directly measured, only estimated, and I often wonder about the accuracy of the measurements.

JR