An increase in biologic activity cause the topsoil in West Virg inia to increase in thickness.
Soil Condition
By increasing the biologic activity, we can increase the thickness of the topsoil in West Virg inia.
The activities that come under biologic are reducing compaction, improving drainage and balancing fertilizer use.
Adding manure, reducing soil disturbance or planting a cover crop are other biologic activities.
Thus option 2. is the correct answer.
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