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Soil formation is dependant upon


A) Climate.
B) Nature of the parent material and organic matter.
C) Topography.
D) Time.
E) All the choices are correct.

F) A) and D)
G) C) and D)

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All soils,by definition,must show well-developed A,B and C horizons.

A) True
B) False

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Uncontaminated rain water has a pH of 5.6 (slightly acidic) because


A) Oxides of sulfur are always present in the atmosphere, even from natural sources.
B) Droplets of water necessarily condense on atmospheric particulate.
C) Most water vapor originates by evaporation from the oceans and sea water is acidic.
D) Upon condensation, water chemically reacts with carbon dioxide forming a weak carbonic acid.

E) A) and B)
F) A) and C)

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In areas with adequate rainfall,such as the northern United States,soil formation is rapid and easily keeps pace with soil erosion.

A) True
B) False

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Soil composed of broadly similar proportions of sand,clay and silt is


A) Loam.
B) Laterite.
C) Pedocal.
D) Leached.

E) A) and B)
F) None of the above

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Which of the following factor is a contributor to soil erosion?


A) Burrowing animals
B) Rain
C) Wind
D) All the choices are correct.

E) B) and D)
F) A) and C)

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