TOM: solids, liquids and gases
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기술
Select samples from an outdoor setting. Magnify the substances to atomic level so that the particles they consist of can be seen. Sort the substances into groups based on how the particles are arranged and how they move. Classify the substances as solids, liquids or gases. For example, classify argon as a gas and ice as a solid. This learning object is the second in a series of six objects that progressively increase in difficulty.
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