convection currents in the mantle volcanic and seismic activity in the crust strong winds and storms rotation of the solid core
I gave my students this multiple choice question: What causes the tectonic plates of Earth to continually move?

Only one answer is correct among these 4 choices:
- convection currents in the mantle
- volcanic and seismic activity in the crust
- strong winds and storms
- rotation of the solid core

Could you tell me which one is correct?

convection currents in the mantle