Which internal heat source still generates heat within the terrestrial worlds today?

Question

Quizplus · Accepted Answer

The internal heat source that still generates heat within the terrestrial worlds today is heat from radioactive decay. This heat is produced by the decay of isotopes such as uranium, thorium, and potassium in the rocky mantles and cores of these worlds. The heat generated by this process is what drives geologic activity such as volcanism and tectonic activity on Earth and other terrestrial planets. Heat of accretion is a source of internal heat in the early stages of a planet's formation but is not relevant today. Heat from differentiation is also an important source of internal heat in the early stages of a planet's formation but becomes less important over time as the planet cools. Heat from convection is a result of internal heating and does not generate heat itself.

Which Internal Heat Source Still Generates Heat Within the Terrestrial