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Learners take on the role of environmental engineers as they design water filters.

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.

Water treatment on a large scale enables the supply of clean drinking water to communities.

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