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In this activity, learners make their own heat waves in an aquarium.

Using two baby food jars, food coloring, and an index card, you'll 'marry' the jars to see how hot water and cold water mix.

It's difficult to see convection currents in any liquid that's undergoing a temperature change, but in this Exploratorium Science Snack, you can see the currents with the help of food coloring.

In this activity, learners investigate convection by using food coloring and water of different temperatures.

This activity about density provides instructions for making a miniature "lava lite" with just salt, oil, water, and food coloring.