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In this activity (on pages 29-35), learners examine water pollution and filtration.

When it rains, water can collect on top of and seep into the ground. Water can also run downhill, carrying soil and pollution with it.

Learners explore capillary action in plants (such as plants ability to move water from roots to leaves) in an investigation called Paper Blooms.

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