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In this activity (page 13 of the PDF), learners discover how weathering and erosion change the Earth’s surface.

$10 - $20 per group Ages 11 - 14 4 to 24 hours
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In this geology activity (page 6 of the PDF), learners explore how carbonic acid can slowly dissolve limestone and form caves.

$1 - $5 per group Ages 11 - 14 10 to 30 minutes