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A soil horizon is a layer of soil parallel to the earth's surface. It has a unique set of physical, chemical, and bio logical properties. The properties of soil Soil Profile: A vertical section of the soil extending through all its horizons and into the parent material. ➢ Soil Horizon: A layer of soil, The various layers are known as horizons. A soil profile contains three main horizons. They are named as horizon A, horizon B and horizon C. A soil profile is a vertical cross section of the soil. When exposed, various soil horizons, or layers of soil, become apparent. Each horizon of soil may be GENETIC SOIL HORIZON DESIGNATIONS. Master horizons. Master horizons and layers. Master horizons of organic materials. Master horizons for mineral soils. This chapter describes soil layers and genetic soil horizons. The genetic horizons are not the equivalent of the diagnostic horizons of Soil Taxonomy.Like a biography, each profile tells a story about the life of a soil. Most soils have three major horizons (A, B, C) and some have an organic horizon (O). The Soil Profile Descriptions. Soils develop in parent material from the time of its deposition under the influence of local climate, topography, and biota. A soil horizon is a layer generally parallel to the soil surface, whose physical characteristics differ from the layers above and beneath. Major Horizons: There