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In this activity, learners explore how engineers design devices that can detect the presence of pollutants in the air.

This activity (on pages 13-18) has learners build a model tree and then figure out how to make their tree stand up by itself.

Working in groups, learners model the continuous destruction and creation of ozone (O3) molecules, which occur in the ozone layer.

Learners observe and discuss a vacuum cleaner as a model of a baghouse, a device used in cleaning industrial air pollution.

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

To convey the concept of how animals adapt to survive, this game asks learners to imagine what adaptations a given animal would need to live in a certain environment—including environments where such

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

In this activity, learners build a model of a self-sustaining habitat (growing grass and beans from seeds).

This is an online simulation of how sound changes due to environment. How does place--like a cave, a pier, or a forest--affect certain sounds?

In this activity, learners construct models of plants that are adapted to living under specific environmental conditions.

In this activity, learners explore the web of connections among living and non-living things.

In this group activity, learners consider environmental conditions—temperature, presence of water, atmosphere, sunlight, and chemical composition—on planets and moons in our solar system to determine

This is an activity about turbidity, or the amount of sediment suspended in water.

Learners test two jars of ice water, one covered and one open, for changes in temperature. After placing the jars in the sun, learners discover that the covered jar cools down more slowly.

Learners see convection currents in action in this highly visual demonstration. Sealed bags of colored hot or cold water are immersed in tanks of water.

Learners develop an understanding of air pressure in two different activities.

Learners build devices from rubber bands to test for invisible air pollutants.

In this outdoor activity, learners cut through and investigate rotten logs and then make log-profile puzzles for each other.

Learners tour their school or home looking for sources of indoor air pollutants (IAPs).

In this outdoor fall activity, learners find out what living in or under a layer of leaves is like.