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Why Doesn’t the Ocean Freeze?
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In this activity, learners explore how salt water freezes in comparison to fresh water.
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Spill Spread
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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.
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Make a "Mummy"
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The Ancient Egyptians used a naturally-occurring salt from the banks of the Nile River, called natron, to mummify their dead.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-000-675.jpg?itok=gt3CzHb-)
Draggin' Boats
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Learners design, build, and test models of "dragon boats" made from up to three milk cartons.
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Watercraft
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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.
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Design a Submarine
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Learners act as engineers and design mini submarines that move in the water like real submarines.
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Soapy Boat
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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.
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Make Your Own Deep-Sea Vent
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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.
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Marshmallow Models
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No glue is needed for learners of any age to become marshmallow architects or engineers.
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Walk On Water Bugs
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In this activity (on pages 29-35), learners examine water pollution and filtration.
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Pop Can "Hero Engine"
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In this activity, learners build water-propelled engines from soft drink cans.
Build A Hydrometer
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In this activity, learners will explore how a hydrometer works by building a working model and conducting experiments.
Water Motor
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In this physics activity (page 10 of the PDF), learners will explore how energy from moving water can be used.