Which factor is identified as the most significant contributor to sustained internal heat required for differentiation?

Answer

Radioactive decay of unstable isotopes

The decay of unstable isotopes like uranium, thorium, and potassium-40 provided the most significant and sustained source of heat necessary to melt materials past their melting points.

Which factor is identified as the most significant contributor to sustained internal heat required for differentiation?
GeologyscienceEarthplanetdifferentiation