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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.

By building a simple watershed with paper and markers and then using a spray bottle to simulate precipitation, learners will understand how pollution accumulates in our water sources, especially from

As a group, learners consider sources of water pollution to understand where pollution starts and where it ends up.

In this activity, learners explore in what ways the shape of the land and the pull of gravity influence how water moves over Earth.

Learners gain an intuitive knowledge of the physical aspects of watersheds by creating their own watershed models.