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    American Museum of Natural History
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    In this activity, pairs of learners will create two make-believe dig sites by burying chicken bones in plaster of Paris--a powder that hardens when wet. Then, learners try to excavate (dig out)...

    $5 - $10 per group Ages 8 - 14 2 to 4 hours
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    Oregon Museum of Science and Industry
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    In this activity, learners will model the mechanical weathering and erosion of rocks in a stream or river. Learners put "stones" made of plaster of paris into a plastic container filled...

    $1 - $5 per group Ages 8 - 11 10 to 30 minutes