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The Amazing Water Trick
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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.
Make a Salt Volcano (Lava Lite)
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This activity about density provides instructions for making a miniature "lava lite" with just salt, oil, water, and food coloring.
Bubble Bomb
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Learn about chemical reactions by making a Bubble Bomb, a plastic bag you can pop with the power of fizz.