Here is a delicious way to review earth science vocabulary. Your class will begin their hands-on journey by role-playing the forces in the rock cycle. Weathering breaks down sandstone pieces, actually pecans or walnuts. Heat and pressure prepare the magma by melting chocolate chips in a microwave for 45 seconds and then stirring. All roles, including erosion, uplifting, time, ocean, plate tectonics, and crust, have clearly defined tasks. The materials needed for this rocking recipe are inexpensive and easy to find.