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The layer of the soil that is dark in colour, has a high content of organic matter is known as : |
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Answer» Humus has a characteristic black or DARK brown color and is an ACCUMULATION of ORGANIC carbon. Besides the three major SOIL horizons of (A) surface/topsoil, (B) subsoil, and (C) substratum, some soils have an organic horizon (O) on the very surface. |
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