It's random, the individual things you might remember from classes in junior high. But I do remember my 8th grade science teacher bemoaning the fact that some local group was putting on a show called "Chemistry Magic", showing the results of different reactions, etc. It's important not to present science as magic, especially in an educational setting, he said (paraphrased).
So, I know they're just trying to sell some rocks (a dubious business to begin with), but let's be clear - pumice is formed when lava cools, and in such a way that it traps a lot of air, resulting in a rock that is lighter than water. Sorry kids, no magic here.
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