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Comparing the amounts of land and water on Earth's surface leads students to discover why it is called the water planet. Students examine photos of Earth taken from space, analyze the results of a globe toss game and compare ocean sizes using pieces of clay to gain a perspective on the amount of surface area that is covered by water. The URL opens to the investigation directory, with links to teacher and student materials, lesson extensions, resources, teaching tips, and assessment strategies. The teacher's guide will begin with a two-page module overview and a list of all standards addressed. This is Investigation one 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.