The Earth's surface is made up of a series of large plates that are are in constant motion. Convection current underneath the plates move in all directions, this convection currents are caused by heated up radioactive decay.
The heat from the inner core rises and produces the convection currents. This convection currents pushes old material to the side, driving the lithosphere plates apart. This explains the cause plate movement.
The heat from the inner core rises and produces the convection currents. This convection currents pushes old material to the side, driving the lithosphere plates apart. This explains the cause plate movement.