What is the primary reason for the inside of Earth being hot?
A) No heat is being generated, but Earth's outer layers have prevented the escape of heat trapped during the planet's initial formation.
B) The decay of radioactive elements is creating heat in Earth's inner layers.
C) The nuclear process of fusing hydrogen into helium like that found in stars is at work in Earth's interior.
D) Huge quantities of oil and natural gas occasionally burn deep within Earth.

Question

Quizplus · Accepted Answer

The primary reason for Earth's internal heat is the decay of radioactive elements, which generates heat in the inner layers.

What Is the Primary Reason for the Inside of Earth