The source or sources of the internal heat of Earth are:
A) tidal stress.
B) radioactive decay.
C) leftover heat of planetary formation.
D) all of the above

Question

Quizplus · Accepted Answer

The internal heat of the Earth is generated by various sources. Tidal stress, which is caused by the gravitational pull of the Moon and the Sun, produces a minimal amount of heat. However, the significant sources of internal heat are radioactive decay and the leftover heat of planetary formation. Radioactive decay of isotopes like uranium, thorium, and potassium produces heat in the Earth's mantle and core. The leftover heat caused by the kinetic energy of dust and gas during planetary formation also contributes to the Earth's internal heat. Therefore, all the options, A, B, and C, are correct, making the answer option D.

The Source or Sources of the Internal Heat of Earth