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Inner Space
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In this activity, learners discover that there is space between molecules even in a cup "full" of water. They first fill a cup with marbles, and then add sand to fill the gaps between the marbles.
Pop Can "Hero Engine"
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In this activity, learners build water-propelled engines from soft drink cans.
Water Cycle in a Bag
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In this activity, learners create a biosphere in a baggie.