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Water on Earth is in lakes, the ocean, rivers, underground, and frozen glaciers.

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

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

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.

In this activity, learners make water rockets to explore Newton's Third Law of Motion. Learners make the rockets out of plastic bottles and use a bicycle pump to pump them with air.

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

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

In this activity, learners build models of atoms and molecules, then consider their role in different phases of matter, density, and mixtures and solutions.

In this activity (located on page 2), learners will construct tiny model geysers out of film canisters, warm water, and antacid seltzer tablets.

Learners work in groups to construct bridges using stale marshmallows and toothpicks.

In this activity (page 2 of PDF under GPS: Cave Swallows Activity), learners will model how caves are formed by placing one piece of chalk in a cup of vinegar and another piece in a cup of water, then

This activity provides a hands-on experience with a scale model, a relatively high viscosity fluid, and feeding behaviors.

In this demonstration, learners compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods.