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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.

Electrolysis is the breakdown of water into hydrogen and oxygen. This Exploratorium activity allows learners to visualize the process with an acid-based indicator.

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