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    California Academy of Sciences
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    In this activity, learners will learn how igneous rock, metamorphic rock, and sedimentary rock are formed as part of the rock cycle and that the same forces that produce/change rocks also produce...

    free Ages 8 - 18 30 to 45 minutes
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    The Exploratorium
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    This is a quick activity that shows how large amounts of rock and sediment are added to the edge of continents during subduction. You may ask, how can such a huge phenomenon be demonstrated quickly...

    1 cent - $1 per student Ages 8 - 18 5 to 10 minutes