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In this outdoor activity, learners saw sections from fallen trees, then count tree rings and look closely at patterns of tree growth.

This activity about cryptographic techniques illustrates a situation where information is shared, and yet none of it is revealed.

This activity (located on page 3 of the PDF under GPS: Temperate Rain Forest Activity) is a full inquiry investigation into tree growth rates.

In this activity (page 1 of the PDF under SciGirls Activity: Dinosaurs), learners will model how paleontologists estimate the age of fossil discoveries by extracting “fossil” playing cards from newspa