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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 investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water.

Learners make their own paper. They start by shredding old newspaper, clean toilet paper, and clean paper towels.

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