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In this activity (on pages 36-39), learners make a model of a watershed out of paper, then run water down the mountain to simulate how rainfall and pollution affect watersheds.

In this online activity, learners build their own system of heavenly bodies and watch the gravitational ballet.

In this activity (on page 8), learners model how marble statues and buildings are affected by acid rain.

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.

In this activity, learners make film canister rocket ships. A fin pattern is glued onto the outside of the canister, and fuel (water and half an antacid tablet) is mixed inside the canister.

In this activity, learners participate in several full-body interactive games to model the process of self-assembly in nature and nanotechnology.