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    Twin Cities Public Television
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    In this quick activity about pollutants and groundwater (page 2 of PDF), learners build a model well with a toilet paper tube. Learners use food coloring to simulate pollutants and observe how they...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    Science Museum of Minnesota
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    The Sacred Cenote at Chichén Itzá is a sink hole, or well, containing groundwater. In this activity, learners create their own cenote using chalk, limestone, acids, and rain water. A real cenote is...

    1 cent - $1 per student Ages 6 - adult 10 to 30 minutes