Here are the two videos, which we watched in class, in case you wanted to see them again.
Below is a link to an animation that shows convection currents at work in the mantle. The blue areas show the cool, denser rock sinking towards the core and the yellow and orange areas show the hotter, less dense rock rising towards the crust.
Mantle Convection Current Animation
Another simple animation of convection and the resulting movement of the plates.
Convection Currents and Plate Movement
