Question

Which best explains how heat plays a role in the movement of materials within Earth’s interior?

Answer 1

Heat from Earth's core and from radioactive decay warms mantle rock, making hotter rock less dense so it slowly rises; when it cools near the surface it becomes denser and sinks. Those slow convection currents transfer heat and physically carry rock and melt within the mantle, driving plate motions, magma movement, and volcanic activity.