Final answer:
Convection currents in the mantle drive plate tectonics.
Step-by-step explanation:
The motion of convection currents drives plate tectonics in the mantle layer of the Earth. Convection currents are caused by the heat generated by the radioactive decay of elements in the Earth's interior. These currents cause the movement of the rigid plates that make up the Earth's lithosphere.
Learn more about Plate tectonics