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The broadest category of classification in Soil Taxonomy specifies 12 soil orders, 11 of which are for mineral soils.

A) True
B) False

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Which of the categories in the Soil Taxonomy system indicates properties that have implications for root growth as well as for the construction of building foundations?


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

F) A) and E)
G) B) and D)

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Because soil development is just beginning in Entisols, these soils are generally less variable in properties than are those in the Andisol or Ultisol orders.

A) True
B) False

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An argillic horizon is a diagnostic horizon characterized by the subsurface accumulation of silicate clays.

A) True
B) False

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Soils in which of the following soil suborders would most likely have a prominent E horizon under the A horizon?


A) Ustox
B) Udalfs
C) Orthents
D) Aquepts
E) Udolls

F) C) and E)
G) C) and D)

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The two most significant characteristics of the classification system used in the United States are a unique system of terminology and focus on measurable soil properties as a primary basis for the classification.

A) True
B) False

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Soils in this order are commonly sandy in texture, quite acidic and develop primarily under coniferous trees in cool to cold climates


A) Mollisols
B) Andisols
C) Spodosols
D) Alfisols
E) Ultisols

F) C) and D)
G) None of the above

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