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

In this simulation, learners explore how ocean currents spread all kinds of pollution—including oil spills, sewage, pesticides and factory waste—far beyond where the pollution originates.

The Ancient Egyptians used a naturally-occurring salt from the banks of the Nile River, called natron, to mummify their dead.

Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

In this design challenge activity, learners build a boat that can hold 25 pennies (or 15 one inch metal washers) for at least ten seconds before sinking.

Learners act as engineers and design mini submarines that move in the water like real submarines.

Learners discover that soap can be used to power a boat. Learners make a simple, flat boat model, put it in water, and then add a drop of detergent at the back of the boat.

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.

No glue is needed for learners of any age to become marshmallow architects or engineers.

In this activity (on pages 29-35), learners examine water pollution and filtration.

In this activity, learners build water-propelled engines from soft drink cans.

In this activity, learners will explore how a hydrometer works by building a working model and conducting experiments.

In this activity, learners create a biosphere in a baggie.

In this physics activity (page 10 of the PDF), learners will explore how energy from moving water can be used.