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

In this activity, learners create models of erosion and floods and learn to recognize both in their environment.

In this biology activity, learners use plastic pipettes to cut wells into the solid gel layer of agar in petri dishes and place solutions of simulated antigen and antibody preparations into the wells.

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.

In this activity, learners evaluate the potential performance of air rockets placed inside a wind tunnel.

In this outdoor activity, learners make their own organic-rich soil. Depending on where this activity is done, learners will probably discover that their local soil is low in organic matter.

In this activity, learners use sand and ice cubes to create a model of permafrost and the effects of the ice melting through the surface.

In this outdoor activity, learners cut through and investigate rotten logs and then make log-profile puzzles for each other.

In this activity, learners take on the role of various parts of the cell in order to model the process of protein synthesis.