Which of the following best describes the source of Earth's internal heat?

Question

Quizplus · Accepted Answer

The source of Earth's internal heat is primarily due to internal friction and radioactive decay in Earth's interior. This heat generates convection currents within the mantle, which in turn drive plate tectonics and volcanic activity. The sun and residual heat from the planet's formation play a minor role in maintaining the planet's internal temperature. The sun and radioactive decay in Earth's interior contribute little to the heat within the planet. Internal friction and the sun are not major contributors to Earth's internal heat, and heat generated by tidal forces is also negligible.

Which of the Following Best Describes the Source of Earth's