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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
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    In this activity, learners design and build a simple wind vane —one of the oldest kinds of weather tools— and use it to show wind direction. The activity can be done outdoors on a windy day or...

    $5 - $10 per group Ages 8 - 14 30 to 45 minutes

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