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What is true about soil layers?

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Soil layers, or horizons, are typically divided into three distinct layers: the topsoil, subsoil, and the parent material. The topsoil is the top layer of soil and is the most nutrient-rich. The subsoil is the layer below the topsoil and is usually composed of clay, silt, and sand. The parent material is the layer of soil that lies beneath the subsoil and is composed of the original material that formed the soil.
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