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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.

Learners combine different plant solutions -- made from fruits, vegetables, and flowers -- with equal amounts of vinegar (acid), water (neutral), and ammonia (base).

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

In this activity, learners explore how environmental engineers might approach solving the problem of an oil spill.