Salt Volcano: Pour several inches of water into a jar. Add about of vegetable oil. Drop in food coloring and observe what happens. Shake salt on top of the oil/water/food coloring mixture. Pour or sprinkle more salt, as desired.
Come learn an easy trick that will get you the most dramatic, puffy, foamy baking soda and vinegar eruptions and learn the science behind it! From Fun at Home with Kids. Baking soda and vinegar mixed with a tough of soap.