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This is a complete and comprehensive unit on matter. It uses a series of hands-on activities, data collection, and take home assignments in which first graders are able to recognize and measure the three states of matter.
http://www.coreknowledge.org/
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This third grade web lesson is designed to help students develop an understanding of the difference between solids, liquids, gases, and adding or removing energy, by investigating the difference between ice and dry ice.
http://seplessons.ucsf.edu/node/279
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What Can We Find Out About Solids?
Go to these web pages to find out why solids are hard. See how you can study these solids yourself.
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