The chief source of the energy that powers geological processes today is
A)the sun.
B)heat left over from the earth's formation.
C)electric currents in the earth's core.
D)radioactivity in the earth's interior.

Question

Quizplus · Accepted Answer

The chief source of energy that powers geological processes today is radioactivity in the Earth's interior. Decay of radioactive isotopes (such as uranium, thorium, and potassium) within Earth generates heat, which drives convection currents in the mantle and causes plate tectonics, volcanic activity, and earthquakes. The heat left over from the Earth's formation also contributes to this energy, but it is a much smaller source compared to radioactivity. The Sun and electric currents in the Earth's core do not play significant roles in powering geological processes.

The Chief Source of the Energy That Powers Geological Processes