convection currents beneath Earth's crust. the rotation of Earth on its axis. the gradual sinking of Earth's crust. heat from the Sun warming Earth.
I gave my students this multiple choice question: The primary cause of continental drift, earthquakes, and volcanic eruptions is

Only one answer is correct among these 4 choices:
- convection currents beneath Earth's crust.
- the rotation of Earth on its axis.
- the gradual sinking of Earth's crust.
- heat from the Sun warming Earth.

Could you tell me which one is correct?

convection currents beneath Earth's crust.