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Educational Level:
Informal education  
Materials Cost:
$1 - $5  
Topics/Subjects:
Engineering and technology  
Instructional Strategies:
Cues, questions, and advanced organizers  
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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.... (View More)

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