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In this collecting/comparing activity, learners work with samples of sand from different places like a lakefront, river, or ocean beach.

In this outdoor activity and animal-role-play game, learners discover and uncover the hidden world of "cryptozoa"—organisms such as spiders, salamanders and slugs that live under objects, like rocks a

In this activity, learners model how the Moon's volcanic period reshaped its earlier features.

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