Answer: Inside Earth, the convection of mantle material is thought to cause the movement of the overriding crustal plates, resulting in events such as earthquakes and volcanic eruptions.
Explanation: Think of paper on top of a flat plate. If you move the plate in various directions. The paper will also move, but it could be in the same, side to side or opposite direction the current is moving. When the crust or mantle moves. Stress is released causing earthquakes and volcanos erupting with magma from below the very ground you walk on.