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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).

In this chemistry demonstration, acid rain is simulated in a petri dish.

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