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    COSI
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    In this chemistry activity (page 3 of the PDF), learners will learn about crystals by growing their very own. They will grow and compare three types of crystals and explore how a crystal forms as...

    $1 - $5 per student Ages 6 - 14 1 to 7 days
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    American Chemical Society
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    In this activity, learners design a crushing test and discover that identifying and controlling the variables may be difficult. Although the crushing test will not give conclusive results, it is a...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    American Chemical Society
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    Learners carefully look at four known household crystals. After observing and describing the crystals, learners are given an unknown crystal, which is chemically the same as one of the four known...

    $1 - $5 per group Ages 8 - 14 30 to 45 minutes