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Weather is a portion of earth science, but making a tornado chamber is not an experiment -- it's a demonstration. The point of an experiment is to ask a question and devise a test which will give results supporting one answer over another.
You need to have two test situations that are...
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Weather IS a portion of Earth Science!!!!! I MAJORED in Earth Science in college and a course in atmospheric science (climatolog/meteorology) was REQUIRED. The egg trick ought to be ok if you relate it to how acid affects the environment, but then the tornado chamber should be okay...