Reference Terms
from Wikipedia, the free encyclopedia


Soil is material capable of supporting plant life.

Soil forms through a variety of soil formation processes, and includes weathered rock "parent material" combined with dead and living organic matter and air.Soils can be divided into two general layers: topsoil, the topmost layer, where most plant roots, microorganisms, and other animal life are located, and subsoil, which is deeper and often more dense and contains less organic matter.

Note:   The above text is excerpted from the Wikipedia article "Soil", which has been released under the GNU Free Documentation License.
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