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Learners explore water's property of cohesion through two investigations.

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.

In this outdoor activity, learners visit the intertidal zone of a rocky coastal site well populated with marine organisms.

Did you know that the water we use today is the same water found on Earth millions of years ago? The Earth constantly uses and recycles water in a process called the water cycle.

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