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In this outdoor biology and math activity, learners estimate the size of a population of organisms too numerous to count.

Using zebra mussels (Dreissena polymorpha), elodea and an indicator dye, learners study the role of light in photosynthesis.

In this outdoor activity, learners search for the warmest and coolest, windiest and calmest, wettest and driest, and brightest and darkest spots in an area.

In this outdoor activity, learners plan a simple foot path and create an environmental impact study of the natural area where the path would be.