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The activities contained in this lesson are designed to introduce students to the basic characteristics of satellite images and their scientific importance. Students will discover how images are derived from satellite signals by creating an image based on "signals" sent by the teacher, use two overlapping images to generate a single mosaic image, and interpret satellite images of a hurricane, flood and volcano to explore how scientists use them to learn about Earth. The URL opens to the investigation directory, with links to teacher and student materials, lesson extensions, resources, teaching tips, and assessment strategies. Note that this is Investigation 3 of four found in the Grades K-4 Module 1 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 1, 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.