Mantle convection is a process of that creates circular currents in the asthenosphere. As a result, the plates slowly move.

Rigid plates that move around Earth's surface is called tectonic plates.

Explanation:

Lithosphere is rigid and relatively cold and is the outer surface of the planet. The convective motions of maintenance break the lithosphere into plates.

This place that a form can move in any direction, can move towards each other, can move away and push each other which is the reason for formation of mountains for shifting of continents for making of ocean basin.