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In this activity, learners estimate how much water they think can be found in various locations on the Earth in all its states (solid, liquid, and gas) to discover the different water ratios in the Ea

free Ages 6 - 14 10 to 30 minutes
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In this math lesson, learners apply the concepts of ratio and proportion to the capture-recapture statistical procedure.

$5 - $10 per group Ages 11 - 14 45 to 60 minutes