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Learners observe working lava lamps to understand how they work (included in PDF link).

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

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.

Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle.

In this physics activity, learners will explore buoyancy.

This activity was designed for blind learners, but all types of learners can utilize it to investigate volume, mass, and density.