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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
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    American Chemical Society
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    In this activity on page 7 of the PDF, learners experiment with the interesting designs that can be made by painting on plaster. Learners discover the chemistry behind fresco, an art technique made...

    $10 - $20 per student Ages 6 - 14 10 to 30 minutes