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First grade scientists learn about changes in the state of matter, but here is a presentation that explains it at a high school level. Illuminating graphics and photos enhance understanding, and the information is disclosed in an order that flows. There is only one tiny problem encountered: on slide #3, the 100-degree temperature in the phase change diagram is cut off. The exact, but corrected, diagram is pretty easy to find online for updating, or you may choose a phase change graph that is more detailed.