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Organic matter distribution in the profile is a significant criterion for differentiating epipedons.

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In soils of which great group would you most likely find wide surface cracks during periods of dry weather?


A) Calciusterts
B) Albaqualfs
C) Argiaquolls
D) Kandiaquults
E) Haplustox

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The nomenclature of Soil Taxonomy is characterized by all but which one of the following statements?


A) Soil names (except for series level) identifies major soil characteristics.
B) The names of the orders all end with the letters sols.
C) The subgroup name also tells you the great group, suborder, and order names.
D) The names give a clear indication of the modes of genesis of the soil.
E) The names are based on measurable properties and not on presumed modes of genesis.

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A soil pedon is ____.


A) a category of Soil Taxonomy
B) a three-dimensional unit that embodies the primary characteristics of an individual soil
C) generally larger in area than a polypedon
D) a diagnostic subsurface horizon prominent in arid regions and in sandy parent materials.
E) a surface horizon used to characterize soil suborders and great groups

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Investigating the soils of northern Canada on summer, you dig a soil pit easily though fairly uniform peat material until, at 75 cm deep, your shovel hits a layer that is frozen solid.Into which type of soil are you most likely digging?


A) Histosol
B) Cryent
C) Fibrist
D) Histel
E) Cryert

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Which of the following categories of Soil Taxonomy provides the greatest specificity of soil properties?


A) series
B) suborder
C) order
D) family
E) great group

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Soils in which of the following suborders would be more likely to occur in Minnesota than in Texas?


A) Fluvents
B) Cryolls
C) Udalfs
D) Usterts
E) Cambids

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In which soil orders would recent alluvium most likely be a common parent material?


A) Ultisols
B) Entisols
C) Andisols
D) Alfisols
E) Aridisols

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Andisols are found mostly near recently active volcanoes.

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A polypedon or individual soil is a group of closely related pedons that conceptually approximates what in the United States is called a soil series.

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Which soil moisture regime has the highest soil moisture levels?


A) udic
B) ustic
C) aquic
D) aridic
E) xeric

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Soils classified as Inceptisols have the least well developed profiles of those in any order in the Soil Taxonomy system.

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Histosols generally have higher organic matter contents than Mollisols.

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The name of a subgroup indicates the order, suborder, and great group of which it is a member.

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Argillic horizons are characterized by ___.


A) accumulation of silicate clays
B) high level of Na+ ions
C) high levels of iron and aluminum oxides
D) impervious hardpan layers
E) organic matter accumulation

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Spodosols are generally less acidic and less sandy than are Alfisols.

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If the soils are to be used for crop production, for which soil order would land drainage be most critical


A) Mollisols
B) Inceptisols
C) Aridisols
D) Oxisols
E) Histosols

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The categories of Soil Taxonomy can be listed from the broadest (first) and most specific (last) as: order, suborder, great group, subgroup, series, family.

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Vertisols are characterized by high contents of swelling-type silicate clays.

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Epipedons are diagnostic subsurface horizons that are one of the primary means of classifying soils in the United States.

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