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A soil profile represents a vertical section of soil that displays its distinct layers, known as horizons, each with unique physical, chemical, and biological characteristics. Understanding these horizons is essential in natural resource management, as soil forms the foundation for both physical and biotic resources. The topmost layer is the O horizon, which consists primarily of organic matter such as decomposed leaves, plant residues, _______ __________ ______ ____ __________ ___ ____ _____ ____ ______ _______ ______.
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