Final answer:
The motion of the convection currents that drive plate movement occurs in the mantle layer of the Earth.
Step-by-step explanation:
The motion of the convection currents that drive plate movement occurs in the mantle layer of the Earth. The mantle is the layer between the Earth's crust and the outer core. It is composed of hot, semi-fluid rock that undergoes convection, creating currents that circulate and drive the movement of the tectonic plates. These convection currents are responsible for processes such as seafloor spreading and the formation of mountains and volcanoes.
Learn more about Convection currents and plate movement