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Students will create a three-dimensional model from a two-dimensional topographic map. They will use the model to trace the path that a water droplet takes across the watershed and into the watercourse, and will describe the relationship between the physical features of the watershed and the location of human activities. Resources needed vary, depending on the kind of model that is to be build, but may include: a topographic map of the local watershed, tracing paper, tempera paints, paint brushes, cutting knife or saw, plaster of Paris or paper mach�, plasticene or other waterproofing, and corrugated cardboard, plywood or other media from which to cut layers representing each of the contour intervals. This activity is part of the Ground Truth Studies Teacher Handbook, which provides more than 20 activities to build student understanding of global change and remote sensing, and includes background chapters for teachers, glossary, and appendices. Resources needed vary, depending on the kind of model that is to be build, but may include: a topographic map of the local watershed, tracing paper, tempera paints, paint brushes, cutting knife or saw, plaster of Paris or paper mach�, plasticene or other waterproofing, and corrugated cardboard, plywood or other media from which to cut layers representing each of the contour intervals.

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