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Multiple activities illustrate the concept of changes in bodies of water over time. Emphasis is placed on the use of remote sensing to monitor changes in water bodies that are due to climate change, erosion, drought, human intervention and natural events. Using clay and water, students evaluate the impact of rising water levels on different coastlines and on coastal cities. Students also analyze satellite images showing three examples of changes caused by water: the melting of the Greenland ice sheet, the flooding in the Midwestern region of the United States and the drought effect on Africa's Lake Chad. The URL opens to the investigation directory, with links to teacher and student materials, lesson extensions, resources, teaching tips, and assessment strategies. This is Investigation 4 of four found in the Grades K-4 Module 2 of Mission Geography. The Mission Geography curriculum integrates data and images from NASA missions with the National Geography Standards. Each of the four investigations in Module 2, while related, can be done independently. Please see Investigation 1 of this module for a two-page module overview and list of all standards addressed.