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Before this exercise, student should be briefly introduced to the concept that rocks can be deformed. I will usually show relevant images from the textbook regarding strike, dip, and basic fold geometry. In addition, I spend some time reviewing compass directions, and how to describe the orientation of a line. After the introduction, each student (or pair of students) is given a flexible piece of foam which is treated as an analog for a sedimentary bed. Students are asked to place their foam into the proper orientation, given the strike and dip measurements. Students are encouraged to help one another as the tasks become more complex.
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