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    Lawrence Hall of Science
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    In this activity, learners explore a bucket of sand and beach objects. First they sort items using observable characteristics, then they turn hard candy into "candy sand" to model where...

    $1 - $5 per group Ages 4 - adult 10 to 30 minutes
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    New Jersey Department of Education
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    In this activity, learners create a freshwater ecosystem in a large plastic bottle. Learners cut and prepare bottles, then fill with water, aquatic plants, snails and fish. Learners observe their...

    $10 - $20 per group Ages 8 - 18 1 to 7 days
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    4-H
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    In this ecology activity, learners make a model water-based ecosystem called a terraqua column. The column (in a large soda bottle) includes pond water, duckweed, sand or gravel, and small snails....

    Over $20 per group Ages 11 - 14 1 to 2 hours