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This activity (on pages 16-23) lets learners measure each other's vital signs—the signs that help doctors understand what's going on in a patient body.

In this investigation learners explore the differences between, and interdependence of, living and nonliving elements in a water ecosystem.

Learners develop awareness and understanding of the daily air quality using the Air Quality Index (AQI) listed in the newspaper or online.

In this activity, learners create a model using metric measuring tapes and atmosphere composition data.

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