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Meaning of A HORIZON

WordNet Dictionary
  1. [n]  the top layer of a soil profile; usually contains humus
  2. [n]  the top layer of a soil profile; usually contains humus
 Synonyms: A horizon, A-horizon
 See Also: humus, soil horizon



Biology Dictionary
 Definition: A distinct layer of soil, more or less parallel with the soil surface, having similar properties such as color, texture and permeability; the soil profile is subdivided into the following major horizons:
  1. A-horizon, characterized by an accumulation of organic material;
  2. B-horizon, characterized by relative accumulation of clay iron, organic matter or aluminum;
  3. C-horizon, the undisturbed and unaltered parent material.
(Some soils have an E-horizon, characterized by leaching of organic and other material.)