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In this activity (on pages 36-39), learners make a model of a watershed out of paper, then run water down the mountain to simulate how rainfall and pollution affect watersheds.

$1 - $5 per group Ages 8 - 14 10 to 30 minutes
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This activity (on page 2 of the PDF under SciGirls Activity: Malformed Frogs) is a full inquiry investigation into using indicator species to assess the health of an environment.

Over $20 per group Ages 8 - 14 1 to 2 hours