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This exercise brings the students to a landscape in the Peruvian Andes in Google Earth, where some alpine and niche glaciers still exist. Their task is to determine glacial extent in the past, and infer the kind of glacier(s) that had existed in the area. In order to answer the question, students need to identify the current ice extent, approximate the equilibrium line altitude based on dirty vs white ice (or the firn line, if visible) in summer time imagery, and document glacial landforms. They also need to recognize the correspondence between elevation and ice extent. Key words: glaciers, glacial landforms, Google Earth
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