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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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    Oregon Museum of Science and Industry
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    In this activity (on pages 25-31 of PDF), learners soak sponges with different amounts of plaster of paris to simulate different levels of calcification in bone formation. After being allowed to...

    $1 - $5 per student Ages 8 - 14 1 to 7 days
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    Oregon Museum of Science and Industry
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    In this activity, learners combine two substances (plaster of Paris and water) to make a cast of an object's imprint in clay. Use this activity to introduce learners to how scientists and...

    $1 - $5 per student Ages 6 - 14 30 to 45 minutes