Question

radioactive decay is a heat source deep within earth. how does this process affect motion within earth?

Explanation:

Radioactive decay generates heat. This heat causes convection currents in the mantle. Convection currents drive plate tectonics, which is the motion of Earth's lithospheric plates.

Answer:

Radioactive decay generates heat. This heat causes convection currents in the mantle. Convection currents drive plate tectonics, which is the motion of Earth's lithospheric plates.