Goodie! I just love some mantle convection, and is there a better way to share my love then on this great little blog? I think not!! Mantle convection is when the heat from the earth's inner core is transfered to the outer core. The plates wouldn't even move without mantle convection!The convection cell happens as the magma rises to the surface, floats, then cools then heats up and cools all over again. It looks a little something like this.
Since there is this convection circle, the lithospheric plate gets dragged with the magma, creating Divergent and Convergent boundaries.
Keep smart!!