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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.

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

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

In this crafty chemistry activity (on page 2 of the PDF), learners make their own paper from used paper they may have otherwise thrown away.

In this activity about camouflage, learners create a model that shows how a flounder is able to blend into a variety of environments.