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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 observe mixtures of sand samples glued to note cards, and consider how sand can differ in size, shape, and color, and where it comes from.

This activity generates learner excitement about light through the creation of a room-sized rainbow.

Learners observe different light sources, outdoors and indoors, using prism glasses (diffraction glasses) and color filters.