Soil Profile and Layers
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acgeiger
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20 QuestionsShow answers
  • Question 1
    20 seconds
    Q. What is a vertical cross section of the soil?
    answer choices
    soil erosion
    soil profile
    soil structure
    soil texture
  • Question 2
    20 seconds
    Q. A soil profile is usually studied to a depth of _________________.
    answer choices
    6-12 inches
    1-2 feet
    3 to 5 feet
    8-10 feet
  • Question 3
    20 seconds
    Q. How is the term translocations defined?
    answer choices
    Materials may be moved within the soil, such as, deeper leaching into the soil or upward movement caused by evaporating water.
    Materials may be lost from the soil as a result of deep leaching or erosion from the surface.
    Materials such as fallen leaves, windblown dust, or chemicals from air pollution may be added to the soil
    Materials may be altered in the soil including the decay of organic matter, the weathering of minerals to smaller particles, and chemical reactions.
  • Question 4
    20 seconds
    Q. What is the uppermost layer of soil consisting of an organic layer made up of partially decayed plant and animal debris?
    answer choices
    A
    B
    O
    R
  • Question 5
    20 seconds
    Q. What term describes the loss of clay, iron, and other materials from topsoil over time due to leaching?
    answer choices
    aviation
    eluviation
    illuviation
    ullinviation
  • Question 6
    20 seconds
    Q. Materials such as fallen leaves, windblown dust, or chemicals from air pollution are considered to be _____.
    answer choices
    additions
    losses
    transformations
    translocations
  • Question 7
    20 seconds
    Q. Which horizon provides the best environment for the growth of plant roots, microorganisms, and other life?
    answer choices
    A
    C
    O
    R
  • Question 8
    20 seconds
    Q. When a soil profile is exposed, various, soil horizons or _____ of soil, become apparent.
    answer choices
    colors
    layers
    structures
    textures
  • Question 9
    20 seconds
    Q. What are three primary soil horizons, called master horizons?
    answer choices
    A, B, and C
    A, O, and R
    C, E, and R
    E, O, and R
  • Question 10
    20 seconds
    Q. Why would it be ill advised to plow soil deeply?
    answer choices
    Bedrock would be exposed to weathering.
    Beneficial soil organisms would be killed.
    Soil aeration/drainage would be altered.
    Subsoil would be brought to the surface.
  • Question 11
    20 seconds
    Q. To which soil horizon does soil erosion caused by deforestation have the biggest impact?
    answer choices
    A
    B
    C
    R
  • Question 12
    20 seconds
    Q. Why is the C horizon unlike the A and B horizons?
    answer choices
    It is exposed to more light, air, and water.
    It is influenced less by the soil-forming processes.
    It is the horizon with the greatest rate of eluviation.
    It typically has much higher iron concentrations.
  • Question 13
    20 seconds
    Q. In which horizon would you find the greatest concentration of humus?
    answer choices
    A
    B
    C
    R
  • Question 14
    20 seconds
    Q. What is the movement of organic matter, chemical substances, and mineral particles from the upper horizons of soil to the lower horizons by the downward movement of water?
    answer choices
    alluviation
    eluviation
    illuviation
    percolation
  • Question 15
    20 seconds
    Q. What process is associated with the buildup of organic matter in prairie soils over many years?
    answer choices
    addition
    losses
    transformations
    translocations
  • Question 16
    20 seconds
    Q. What is the primary factor in determining the color of subsoils?
    answer choices
    the degree of drainage
    the level of earthworm activity
    the percentage of sand
    the type of plant growth
  • Question 17
    20 seconds
    Q. Colors associated with surface soils are determined by the amount of __________ found in the soils.
    answer choices
    microorganisms
    mineral matter
    organic matter
    nutrients
  • Question 18
    20 seconds
    Q. What is the primary factor in determining the color of subsoils?
    answer choices
    the degree of drainage
    the level of earthworm activity
    the percentage of sand
    the type of plant growth
  • Question 19
    20 seconds
    Q. Why are forest soils lighter in color than prairie soils?
    answer choices
    Fewer partially decayed roots have accumulated over time.
    Forest soils have an unusually high pH level.
    The texture of forest soils tends to be very coarse.
    Water drains rapidly from forest soils.
  • Question 20
    20 seconds
    Q. Which element in the presence of good aeration influences the color of soil?
    answer choices
    boron
    chlorine
    hydrogen
    iron
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