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In this activity, learners build an electric two-paddle boat using paint paddles, plastic knives, and empty water bottles.

In this activity, learners explore density and buoyancy as they design and construct rafts.

In this activity, learners build an old-fashioned paddle boat out of simple materials.

In this activity, learners build a speedboat using paint paddles, a propeller, and film canister. Learners attach a simple circuit and motor to the boat to power the propellers.

In this activity, learners build styrofoam boats powered by twisted rubber bands.

In this activity, learners will explore how density is affected by temperature and how that can create currents.

In this activity, learners create a model of a hot air balloon using tissue paper and a hairdryer. Educators can use this activity to introduce learners to density and its role in why things float.

In this activity, learners build a hot air balloon using just a few sheets of tissue paper and a hair dryer.