Question

question 20 radioactive decay is a heat source deep within earth. how does this process affect motion within earth? a the density of molten rock decreases as it is heated, and this results in the rock being pushed above by material with a greater density. b the heat radiates in all directions, and this thermal push forces the surrounding material to move away in all directions. c the volume of the material decreases as it decays, and the surrounding molten rock moves toward the center to fill the void. d the heat breaks the surrounding rocks, which allows subsurface liquids to move in and slow the movement of the nearby rock.

Explanation:

Radioactive decay - generated heat warms molten rock. As density of heated molten rock decreases, less - dense rock is pushed up by more - dense surrounding material due to buoyancy principles.

Answer:

A. The density of molten rock decreases as it is heated, and this results in the rock being pushed above by material with a greater density.