A few centimeters' thickness of prime farmland soil may require 500 years to mature.
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Q110: Entisols have several very distinct horizons.
Q111: Desertification is affecting over a billion people
Q112: Prior to the U.S. Soil Taxonomy system,
Q113: Oxisols are not very fertile.
Q114: Alifols, Mollisols, and Aridisols form an east
Q116: Though Oxisols occur in the world's tropical
Q117: Salinization is often associated with Aridisols.
Q118: Soils with a high concentration of hydrogen
Q119: A soil order is the lowest and
Q120: Both Gelisols and Histosols have high organic
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