The topsoil is where all the rich, nutrient-filled, plant-producing soil resides. It is the usable layer of earth for agricultural production because it includes elements like Phosphorus, Potassium, Nitrogen, Magnesium, Calcium, and Sulfur that are necessary for plant growth. The width of top soil can be as thick as several feet, or nonexistent when erosion is commonplace. Wind and rain can erode soil to the point of being unusable for agriculture.
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