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In this outdoor activity, learners investigate the relationship between the slope of a trail and soil erosion.

This activity guide includes instructions on how to build a "Shake Table" by mounting an eccentric mass (off center) on the shaft of a small dc motor.

This lesson challenges groups of learners to design and construct a wind generator with the most electrical output.

In this highly physical outdoor activity, learners construct and compare experimental trail sections to select the best trail-construction technique for their site.