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    The Exploratorium
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    In this activity, learners use crayons to draw conclusions about rocks and the rock cycle. Learners form crayons ((which can be "weathered"—heated, compressed and cooled—like rocks) into...

    $5 - $10 per group Ages 8 - 18 45 to 60 minutes
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    Twin Cities Public Television
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    In this quick activity (page 2 of PDF under GPS: Lava Flow Activity), learners will model how large depressions near the top of a volcano are formed by using an inflating and deflating balloon...

    $5 - $10 per group Ages 8 - 14 30 to 45 minutes
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    Children's Museum Of Houston
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    This is part 3 of the three-part "Crayon Rock Cycle" activity. Before starting this section, learners must have completed part 1: sedimentary rock and part 2: metamorphic rocks. In this...

    $5 - $10 per student Ages 4 - adult 10 to 30 minutes