Soil is the superficial covering of most of the earth's land area. This soil is made up of minerals and organic particles produced by organic decay. The main components of soil are undissolved inorganic compounds, soluble nutrients, organic matter, water, and gases. The physical nature of soil is determined by the proportions of different sizes. Inorganic particles range from large particles such as stone and gravel, to smaller particles. The smaller particles or species provide a reservoire f
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