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

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

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

Making liquids of different densities to perfectly lay on top of each other can be a frustrating exercise. The Exploratorium created this activity as a fool proof way of making a density column.

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.