Final answer:
The force that drives earthquake activity is Tectonic plate movement.
Step-by-step explanation:
The force that drives earthquake activity is Tectonic plate movement. Tectonic plates are huge sections of the Earth's lithosphere that shift and collide with each other. These movements, known as plate tectonics, are driven by the convective currents in the Earth's mantle. When the plates interact along their boundaries, it can create stress and build up energy, eventually resulting in earthquakes.