Radioactive decay within the Earth produces heat; the other form of heat produced by the Earth comes from:

A) heat trapped when the Earth was formed
B) solar radiation trapped in the rock on the Earth's surface
C) heat produced by air as it moves across the oceans

Radioactive Decay

The spontaneous disintegration and emission of particles from an unstable atom.

Solar Radiation

The electromagnetic energy emitted by the sun, including visible light, ultraviolet light, and infrared energy, which drives Earth's climate system.

Trapped Heat

Heat that is contained within a system, such as the Earth's atmosphere or oceans, not easily released back into space, contributing to warming effects.