The internal heat from Earth's early melting event and from the continued decay of radioactive isotopes has allowed the interior of the Earth to remain hot even though the surface has cooled off.

Question

Quizplus · Accepted Answer

The internal heat from Earth's early melting event and from the continued decay of radioactive isotopes has indeed allowed the interior of the Earth to remain hot even though the surface has cooled off. This is why we have a liquid outer core and a solid inner core.

The Internal Heat from Earth's Early Melting Event and from the Continued