A simulation of crustal plate movement due to mantle convection - Place a glass baking pan half filled with water on an electric hot plate. Turn on the heater. Using canned biscuit dough, tear nickel-sized pieces and place on water in the center of the pan. Have student observe and record biscuit (plate) movements due to the convection currents in the water (mantle). Ask students to write a brief description of how their observations of this activity relate to the movement of the crustal plates.