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Kara Kelso Earth Science July 14, 2010 Plate Tectonics Materials: 1 snickers bar 1 tooth pick First step: Set your snickers bar on a flat surface. Take your toothpick and make a few breaks in the snickers outer covering. This covering plays as the earths crust. Second step: Pull on the edges of the snickers bar. This illustrates the tension associated with normal faults(when the plates start moving away from each other). When doing this step you will notice the plates moving apart revealing the inner caramel/nuts. The caramel and nuts are a mock asthenosphere(the upper mantle of the earth. It lies right below the lithosphere). Third step: To show the force of shearing the students then push both ends of the candy bar back together, then slide one half of the candy bar forward and the other half backwards. Fourth step: To illustrate compression have the students then push on the ends of the candy bar once more to squeeze it all together. Students should notice plates colliding and possibly one half sliding over the top of the other. Conclusion: What should be understood from this project is down deep in the earth the plates are always shifting apart and over time colliding back together. When plates meet back up after the normal and reverse faults happen many things can happen, one being mountain-building as you saw in the demonstration. More disastrous things can occur though. Such as, earthquakes and volcanos.