The high temperature of the Earth's interior is due mostly to
A)great internal pressure.
B)friction,as plates move past one another.
C)the Earth's natural heat.
D)radioactivity.

Question

Quizplus · Accepted Answer

Radioactivity is the main source of heat in the Earth's interior. The decay of radioactive elements, such as uranium and thorium, produces heat that is released into the surrounding rocks and magma. This heat contributes to the high temperature of the Earth's interior.

The High Temperature of the Earth's Interior Is Due Mostly