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The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water.

In this quick and easy activity and/or demonstration, learners illustrate the effect of the weight of air over our heads.

Learners compare the properties and solubilities of Styrofoam (TM), ecofoam packing peanuts, and popcorn. First, the solubility of each substance is tested in water.

In this astrobiology activity (on page 11 of the PDF), learners consider what organisms need in order to live (water, nutrients, and energy).

This experiment is designed to illustrate how fluids, including water, have the ability to flow.

This is a demonstration about how nature inspires nanotechnology. It is easily adapted into a hands-on activity for an individual or groups.

Lakes, streams and other freshwater bodies are a habitat for lots of living things, big and small.

In this activity, learners create a soil and water model of a single-cell life environment and study living microorganisms.

Where rainwater goes after the rain stops? And why there are rivers and lakes in some parts of the land but not in others?

In this two-part lesson, learners discover how large bodies of water can serve as a heat source or sink at different times and how proximity to water moderates climate along the coast.

In this quick and easy activity and/or demonstration, learners use two empty 2-liter bottles and hot tap water to illustrate the effect of heat on pressure.

In this activity, learners create a sealed, mini ecosystem that supplies freshwater shrimp with food, oxygen, and waste processing for at least three months.

In this activity, learners explore how watermills have helped harness energy from water through the ages.

This is part 2 of the three-part "Crayon Rock Cycle" activity and must be done after part 1: Sedimentary Rocks. In this activity, learners explore how metamorphic rocks form.

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

Learners explore the variables that affect the properties of ice and the places where different types of ice are found.

In this activity, learners explore how light and dark colored objects absorb the Sun's radiations at different rates.

In this outdoor activity/field trip, learners locate and study plants and animals in several freshwater pond habitats.

In this activity (on pages 36-39), learners make a model of a watershed out of paper, then run water down the mountain to simulate how rainfall and pollution affect watersheds.

In this drawing/mapping activity, learners design plots of land while incorporating positive strategies for improving water quality.