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Learners model the processes that formed some of Earth's largest mountain ranges: the Himalayas, the Andes, and the Alps.

1 cent - $1 per student Ages 8 - 11 10 to 30 minutes
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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