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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.
Make a Salt Volcano (Lava Lite)
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This activity about density provides instructions for making a miniature "lava lite" with just salt, oil, water, and food coloring.
Changing the Density of a Liquid: Heating and Cooling
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Learners investigate how the temperature of water affects its density.
Changing the Density of an Object: Adding Material
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Learners see that a can of regular cola sinks while a can of diet cola floats. As a demonstration, bubble wrap is taped to the can of regular cola to make it float.