Soil Formation and Thickness
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Questions and Answers

What is soil ultimately dependent upon?

  • the forces of nature
  • its thickness
  • the life dependent on it (correct)
  • the productivity of the Earth's skin
  • What determines the balance of soil thickness?

  • climate and organisms
  • weathering and soil transport (correct)
  • rock erosion and soil transport
  • storage input and output
  • What is the primary factor that affects weathering rates?

  • temperature
  • type of native vegetation
  • precipitation (correct)
  • parental material
  • What is the role of plants in soil formation?

    <p>they stabilize soil profiles</p> Signup and view all the answers

    What determines the texture of soil?

    <p>parental material</p> Signup and view all the answers

    What is the effect of darker minerals on soil fertility?

    <p>they increase soil fertility</p> Signup and view all the answers

    What is the primary factor that determines the rate of soil formation?

    <p>Time</p> Signup and view all the answers

    What is the typical rate of soil development in centimeters per year?

    <p>0.025 cm/yr</p> Signup and view all the answers

    What is the name of the soil horizon that consists of organic matter?

    <p>O Horizon</p> Signup and view all the answers

    What is the diameter of very fine sand in millimeters, according to the USDA Classification?

    <p>0.05-0.10 mm</p> Signup and view all the answers

    What is the range of diameters for the three fractions of mineral matter in soil?

    <p>0.002-2.0 mm</p> Signup and view all the answers

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