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In this geology activity, learners create a model using a mixture of salt and sand inside a CD case. When the case is tilted or inverted, the mixture dramatically sorts into a layered pattern.

In this activity, learners discover the primary physical properties used to separate pure substances from mixtures.

In this activity, learners work in groups to determine the mass and volume of four samples: glass marbles, steel washers or nuts, pieces of pine wood, and pieces of PVC pipe.

In this activity, learners can create five-layer density columns by employing one of three (or all) methods.

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

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.

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

In this activity, learners use basic measurements of the Earth and pieces of rock and iron to estimate the mass of the Earth.

In this activity, learners observe as soap bubbles float on a cushion of carbon dioxide gas. Learners blow bubbles into an aquarium filled with a slab of dry ice.