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In this activity, learners create a map of a hidden surface using a "sounding stick" -- a technique similar to how underwater maps were once made.

In this activity, learners sample a star field to estimate the number of stars in the universe.

In this activity (on pages 10-17), learners discover how scientists study biodiversity and the health of the environment based on inspection of small areas—a process known as sampling.

In this field study, learners discover how to collect data in the field and how their efforts can help certain animals, specifically, amphibians.