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In this introductory demonstration and activity, learners are introduced to the concept of density as they explore a rock and a wooden block in water.

In this activity, learners explore how salt water freezes in comparison to fresh water.

In this activity/demonstration, learners observe what happens when two ping pong balls are suspended in the air by a hair dryer. Use this activity to demonstrate how rain drops grow by coalescence.

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

In this nanoscience activity, learners discover that it's easy to pour water out of a regular-sized cup, but not out of a miniature cup.

In this simple activity, learners explore ocean waves. To find out if water moves forward toward the shore, learners create waves in a simulated ocean (small aquarium tank of water).

Learners model the ocean currents that carry hot water from the tropics to northern latitudes.

In this quick activity (located on page 2 of the PDF under GPS Wetlands Activity), learners will model how wetlands act as natural filters for the environment.

In this quick activity about pollutants and groundwater (page 2 of PDF under Water Clean-up Activity), learners build a model well with a toilet paper tube.

This three-part activity consists of an activity that groups of learners develop themselves, a given procedure, and an optional demonstration.

In this outdoor, sunny day activity, learners experiment with paper leaf models to discover how some desert plants conserve water.

In this activity, learners will explore how water affects marker on filter paper. Learners will use science process skills such as making observations and predictions as they explore color.

In this simple activity, learners investigate refraction by placing a picture of an arrow behind a glass of water.

Learners are challenged to discover the relative densities of colored liquids to create a rainbow pattern in a test tube.

As a model of acid rain, learners water plants with three different solutions: water only, vinegar only, vinegar-water mixture.

In this outdoor activity, learners compare the moisture released from different kinds of leaves and from different parts of the same leaf, by observing the color change of cobalt chloride paper.

How many colors make black? Gather as many water soluble black markers as you can find.

Learners design their own experiment to determine which M&M color dissolves the fastest in water.

In this activity, learners observe color mixing and absorbency using colored tissue paper and spray bottles.

In this activity, learners make a model of the hot water of a deep sea vent in the cold water of the ocean to learn about one of the ocean's most amazing and bizarre underwater habitats.