The time necessary for soil formation is about equal to that for soil degradation.
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Q108: Organic material generally comprises less than 5%
Q109: Ultisols generally lack _.
A) clay
B) iron
C) humus
D)
Q110: An Alfisol is most closely related to
Q111: The most weathered and leached of all
Q112: Humus eventually becomes litter.
Q114: Soil microorganisms must be destroyed in order
Q115: The regolith is found on top of
Q116: Water and air move through the upper
Q117: Bacteria are among the most important of
Q118: The soils which are red with a
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