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This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

free Ages 8 - 18 10 to 30 minutes
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In this physics activity, learners will explore buoyancy.

1 cent - $1 per student Ages 4 - adult 10 to 30 minutes
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In this outdoor activity, learners race small boats, made of cork, balsa wood, popsicle sticks etc., to investigate the rate and direction of currents in a stream or creek.

$10 - $20 per group Ages 8 - 18 45 to 60 minutes