The theory of plate tectonics explains that Earth's crust is divided into large sections that are constantly moving. This movement is primarily driven by what process within the Earth's mantle?

✓ Correct Answer: Option B

Convection currents in the semi-fluid mantle, driven by heat from the Earth's core, cause the tectonic plates to move. Hotter, less dense material rises, while cooler, denser material sinks, creating a continuous cycle.