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In this activity, learners explore the different salinities of various sources of water by taste-testing.

In this activity, learners explore how air warms when it condenses water vapor or makes clouds.

In this activity, learners conduct an experiment to explore how water flows up from a tree's roots to its leafy crown.

Cool off in the heat with this project! Learners use simple materials to build a fan that runs on a motor.

In this activity, learners calculate the number of milliliters of water a nearby tree transpires per day.

In this activity, learners observe the effect of transpiration as water is moved from the ground to the atmosphere.

In this activity, learners observe the hydrologic cycle in action as water evaporates and condenses to form rain right before their eyes.

In this activity, learners discover how sweating makes us feel cooler. Learners put on one damp sock and one dry sock and sit in front of a fan.

In this activity, learners try to revive wilted celery. Learners discover that plants wilt when their cells lose water through evaporation. Use this activity to introduce capillary action.

In this activity on page 7 of the PDF (Plants—The Green Machines), learners examine the effects that light and air have on green plants.