What is the primary cause of continental plate movement?

A. Rotation on its axis.

B. Density differences within the atmosphere.

C. Uneven heating of the mantle.

D. Gravitational pull of the moon on continents.

C.

Explanation:

The force that causes most of the plate movement is thermal convection, where heat from the Earth's interior causes currents of hot rising magma and cooler sinking magma to flow, moving the plates of the crust along with them.