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Quote: Yeah, according to my kiddo, while it is an earth science, unless you can make that tornado chamber tear up something to measure the "wind" strength, it makes a pretty toy and not much else. At least with the egg trick you have a method of measure. Not sure but he made a comment about...

Quote: Was a suggestion from my kiddo who did the same thing when he was in 8th grade for some environmental class.

Even more fun, use any color but white egg. Makes the change from shelled to nekkid egg more obvious. Try this link http://www.edinformatics.com/math_science/science_of_cooking/naked_egg_experiment.htm It can also be used to explain osmosis as well as acid rain effects but for earth sciences...

Quote: Both egg shells and limestone are composed of calcium... the vinegar simulates the effects of acid rain on limestone buildings and structures.

Quote: The old egg and vinegar experiment may work. Two eggs and two jars. In this case, the liquid you submerse the egg in would be the independent variable. One egg goes in water, the other in a 50-50 mix of white vinegar. After 24 hours, the egg shell should be gone in the vinegar jar...