[sidewndr46]

What makes you think geothermal is only from nuclear decay? The core is hot because of the forces the moon puts on it as well.

[Retric]

Yea, there’s also leftover energy from the earth’s formation. Nuclear decay + moon + sun (tides and sunlight) + residual heat together all contribute to the amount of available energy.

[Gravityloss]

Nothing. I used those words to distinguish from the other kind of shallow geothermal in nongeologically active areas.