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Learners use a commercially available toy to experiment with density. They fill a chamber in the toy submarine with baking powder and release it into a tank of water.

Learners see convection currents in action in this highly visual demonstration. Sealed bags of colored hot or cold water are immersed in tanks of water.

In this quick activity (located on page 2 of the PDF under GPS: Balloon Fiesta Activity), learners will see the effects of convection and understand what makes hot air balloons rise.

This hands-on experiment will provide learners with an understanding of the issues that surround environmental cleanup.

In this design challenge activity, learners make a balloon hover at eye level for five seconds, and then make it move by creating air currents.