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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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In this activity (page 2 of PDF under GPS: Glaciers Activity), learners will measure the rate at which water streams out of a leaky cup.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners will model the mechanical weathering and erosion of rocks in a stream or river.

$1 - $5 per group Ages 8 - 11 10 to 30 minutes