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To prepare for this case study, students do background reading on landslides and rock avalanches and read the introductory portion of Hermanns and Strecker's 1999 article on rock avalanches in Argentina. In class, students receive data (assembled from figures in the article) on bedrock geology and physiography, as well as stereonets showing orientations of prominent joint sets, bedding, and foliations in the bedrock. Their task is to answer the question of why gigantic rock avalanches occur is some places but not others in this part of Argentina. The activity gives students practice in interpreting geologic maps, using stereonets, and peer teaching. Each student receives one of four possible data sets and must ultimately explain his/her analysis to others. The activity also connects structural geology to another geoscience discipline.
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This section should include notes and tips for instructors who might use the activity. Information such as common areas of confusion, things that need reinforcement, safety guidelines and other practical tips, and pointers for making the best use of the activity are appropriate. Note that this section should complement, rather than repeat, the more general guidance about the teaching method provided in the methods module of which this activity is a part.