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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.

In this activity on page 24, learners perform experiments to examine whether or not trash can float, blow around, or wash away.

Learners design their own experiment to investigate how pollution diffuses through ground material.

In a class demonstration, learners observe a simple water cycle model to better understand its role in pollutant transport.