A hilltop completely denuded of A-horizon soil in a field near Guthrie Center, IA. (IMAGE)

Proceedings of the National Academy of Sciences

A hilltop completely denuded of A-horizon soil in a field near Guthrie Center, IA.

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A hilltop completely denuded of A-horizon soil in a field near Guthrie Center, IA.

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Image credit: Evan Thaler

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