topsoil

(noun)

top layer of soil containing humus at its surface and decomposing vegetation at its base; the most fertile soil

Related Terms

  • subsoil

Examples of topsoil in the following topics:

  • Physical Properties of Soil

    • Topsoil, the top layer of soil, is usually two to three inches deep, but this depth can vary considerably.
    • For instance, river deltas, such as the Mississippi River delta, have deep layers of topsoil.
    • Topsoil is rich in organic material.
  • The Importance of Seedless Vascular Plants

    • Ferns contribute to the environment by promoting the weathering of rock, accelerating the formation of topsoil, and slowing down erosion by spreading rhizomes in the soil.
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