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

In this activity, learners build a model of a self-sustaining habitat (growing grass and beans from seeds).

In this outdoor activity, learners search for lichen, a combination of a fungus and an alga living together. Lichen grow where most other plants cannot, on rocks, the trunks of trees, logs and sand.