1. Soil climate (e.g. aquic moisture regime, cryic temperature regime).
2. Genetic differences due to to climate and vegetation (e.g.calcic or argillic
horizons in Aridisols).
3. Mineralogical differences (e.g.volvanic glass in Andisols (Vitrands)).
jim items answered the question on October 8, 2018 at 11:19
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