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    University of Nebraska State Museum
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    In this activity (on pages 29-35), learners examine water pollution and filtration. First, learners build models of water bugs from paper clips, and test the effect of dirt and detergent on their ...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    Twin Cities Public Television
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    In this quick activity (located on page 2 of the PDF under GPS Wetlands Activity), learners will model how wetlands act as natural filters for the environment. Learners prepare a mixture of water,...

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