> Geothermal is fission Geothermal is not nuclear fission. The heat comes from a combination of primordial heat (from the gravitational energy turned to heat a

> Geothermal is fission Geothermal is not nuclear fission. The heat comes from a combination of primordial heat (from the gravitational energy turned to heat as the Earth formed) and radioactive decay (which is some combination of alpha and beta decays; spontaneous fission is extremely rare.)