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Learners observe and discuss a simple model of a wet scrubber, a device for cleaning industrial air pollution.

In this activity related to indoor air pollution, learners build take-home dust catchers with wax paper and petroleum jelly.

This lesson (on pages 15-24 of PDF) explores how sound is caused by vibrating objects. It explains that we hear by feeling vibrations passing through the air.

By participating in a seed scavenger hunt, learners examine many adaptations of seeds, including how many seeds a plant makes, how those seeds travel to new locations, and what protects them from pred