What drives the spreading process of a plate tectonics?

Answer 1

The spreading process of plate tectonics is primarily driven by mantle convection, where hot, less dense material rises toward the Earth's surface while cooler, denser material sinks. This movement creates currents in the mantle that push tectonic plates apart at mid-ocean ridges, leading to seafloor spreading. Additionally, the gravitational pull of the subducting plates and slab pull further contributes to the movement of tectonic plates. These combined forces facilitate the dynamic nature of the Earth's lithosphere.