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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 experiment, learners will conduct chemical and physical tests to identify mystery substances. This experiment is very flexible, allowing educators to determine the number of unknowns to...

    $5 - $10 per group Ages 8 - 14 45 to 60 minutes

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