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    New Jersey Department of Education
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    In this investigation learners explore the differences between, and interdependence of, living and nonliving elements in a water ecosystem. Learners identify biotic (living) and abiotic (nonliving)...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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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