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In this activity, learners create channel features with flowing water, comparing their observations to real images of Mars and Earth taken by satellites/orbiters. Learners' observations of the ways in which flowing water alters the surrounding terrain are used as clues to draw conclusions about Mars’ geologic past and its ability to support life, as well as how scientists view these features from space. This activity is part of a 60-minute set of activities in which learners, ages 8–13, explore and compare the features of Mars and Earth, discuss what the features suggest about the history of Mars, and create a model to help them understand how scientists view and study other worlds--like Mars. The activities help to show why scientists are interested in exploring Mars for evidence of past life, and address the question: "Why are we searching for life on Mars?"
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