* Convection Currents: Heat from the Earth's core causes the mantle to slowly circulate in a process called convection. Hotter, less dense material rises, while cooler, denser material sinks. This creates a circular motion within the mantle.
* Plate Movement: The Earth's lithosphere (the rigid outer layer) is broken into large plates that move along the top of the convection currents. These currents act like a conveyor belt, dragging the plates along with them.
* Convergent Boundaries: When two plates collide at a convergent boundary, the denser plate subducts (sinks) beneath the less dense plate. This process is driven by the convection currents pushing the plates towards each other.
In summary: The primary force driving convergent boundaries is the mantle convection, which acts as a powerful force that drives the movement of the Earth's plates, leading to collisions and subduction zones.
