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In this online interactive, learners use fossils to infer temperatures 55 million years ago, at the sites where the fossils were found.

free Ages 11 - 18 10 to 30 minutes
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In this activity, learners calculate the number of milliliters of water a nearby tree transpires per day.

$1 - $5 per group Ages 14 - 18 4 to 24 hours
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In this outdoor activity, learners cut through and investigate rotten logs and then make log-profile puzzles for each other.

Over $20 per group Ages 8 - adult 45 to 60 minutes