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In this activity, students experiment to test the hypothesis that Mars was once hotter. The activity requires some advance preparation by the teacher: the day before the activity, need to place a plastic bottle filled with water in the freezer. Materials needed include plastic bottle of water and thermometer. It is a companion piece to a CD about the exploration of Mars that uses song and drama to tell the story of Spirit and Opportunity, NASA's Mars Exploration Rovers, and their mission to search for signs of ancient water.