Soil Composition and Interaction with the Biosphere
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Questions and Answers

What causes the red color in soils?

  • Unhydrated iron oxides (correct)
  • Manganese oxide
  • Partially hydrated iron oxide
  • Magnesium sulfate
  • What does a well-developed red color in soil indicate?

  • Presence of manganese oxide
  • Good drainage and aeration (correct)
  • Low humidity
  • High organic matter content
  • Why are yellow soils prevalent in regions of high humidity?

  • Lack of iron oxides
  • High magnesium content
  • Presence of organic matter
  • Moist soil climate (correct)
  • What makes grey or white soils almost invariably unproductive?

    <p>Failure to accumulate organic matter</p> Signup and view all the answers

    Why may well-drained sands appear yellow in color?

    <p>Iron oxide coloring the sand</p> Signup and view all the answers

    Why must soil lumps be broken up when describing soil color?

    <p>To assess soil structure and porosity</p> Signup and view all the answers

    What is soil defined as?

    <p>A mixture of rock, mineral material, organic matter, gases, and water</p> Signup and view all the answers

    What does the depth of color in dark-colored soils indicate?

    <p>The richness in organic matter</p> Signup and view all the answers

    Why does the color of the soil not always provide a good indication of the amount of organic matter?

    <p>Due to the presence of iron, manganese, or carbon compounds</p> Signup and view all the answers

    Which component holds the soil atmosphere and soil solution?

    <p>Porous phase</p> Signup and view all the answers

    In well-drained soils, what may varying soil color indicate?

    <p>Increasing amount of organic matter</p> Signup and view all the answers

    What contributes to the variation in soil color in different types of soils?

    <p>Amount of organic matter and non-organic factors</p> Signup and view all the answers

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