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To prepare for this activity the students are to have read the chapter in the book relating to rock deformation. We have discussed metamorphism and have used a couple of other related demos. I relate ductile deformation to bending clay or a coat hanger and brittle to breaking a pencil or a plastic rod. I graph these on the black board and we discuss what might happen if we mixed materials or changed the temperature. I then break out the Milky Way bars and pass them out. They are to bend them in half and write down what they observe. Sometimes I break into groups to discuss if there is time otherwise we go over the behavior and pass in the assignment.
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