soil horizon

Noun
  1. is a type of: horizon - a specific layer or stratum of soil or subsoil in a vertical cross section of land
    specific instances:
    • a horizon, a-horizon - the top layer of a soil profile; usually contains humus
    • b horizon, b-horizon - immediately below the A-horizon; contains deposits of organic matter leached from surface soils
    • c horizon, c-horizon - beneath the B-horizon and above the bedrock; consisting of weathered rock
    is a part of: profile - a vertical section of the Earth's crust showing the different horizons or layers

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