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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
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Visitors observe three beakers. One beaker contains an egg immersed in vinegar. Visitors observe carbon dioxide gas escaping from the shell as the calcium carbonate reacts with the vinegar.

$5 - $10 per group Ages 6 - adult Under 5 minutes