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Changing the Density of a Liquid: Adding Salt
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Learners see that a carrot slice sinks in fresh water and floats in saltwater.
Weighty Questions
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In this activity about humans and space travel (page 1 of PDF), learners compare and contrast the behavior of a water-filled plastic bag, both outside and inside of a container of water.
Melting Ice
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In this activity, learners explore density, convection, stratification, and, by inference, the melting of icebergs. Learners make hypotheses, test their hypotheses, and explain their observations.
Convection Demonstration
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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.
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.