Weathering and Its Types
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Questions and Answers

What does weathering refer to?

The disintegration and decomposition of rocks.

What is regolith?

  • The solid ground beneath the soil.
  • A type of sedimentary rock.
  • The uppermost layer of soil.
  • A loose layer of fragments that covers much of Earth’s surface. (correct)
  • Mechanical weathering alters the chemical composition of rocks.

    False

    Which of the following is a process of mechanical weathering?

    <p>Frost wedging</p> Signup and view all the answers

    What happens during thermal expansion and contraction?

    <p>Materials crack and separate due to repeated heating and cooling.</p> Signup and view all the answers

    Match the types of weathering with their definitions:

    <p>Mechanical/Physical Weathering = Processes that break a rock into smaller pieces without altering its composition Chemical Weathering = Processes that change the chemical composition of rocks and minerals</p> Signup and view all the answers

    What are some factors that can control weathering and mass movement?

    <p>Air, moisture, living organisms, and rock composition.</p> Signup and view all the answers

    Study Notes

    Weathering

    • Weathering is the disintegration and decomposition of rocks, including physical and chemical breakdown.
    • Regolith is a loose layer of fragments covering much of Earth's surface.
    • Soil is the uppermost layer of regolith that supports rooted plants.

    Types of Weathering

    • Mechanical/Physical Weathering breaks rocks into smaller fragments, but doesn't change composition.
      • Frost Wedging: expansion of freezing water in cracks causes rock to break.
      • Thermal Expansion and Contraction: Repeated heating and cooling can crack and separate materials due to volume changes.
      • Mechanical Exfoliation: Sheeting or peeling off layers of rock due to pressure release.
      • Abrasion: Wearing down by friction from wind, water, or gravity.
      • Plant Growth: Roots growing in cracks can exert pressure and break rocks.
    • Chemical Weathering: Changes the chemical composition of rocks and minerals.

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    Description

    Explore the fascinating processes of weathering, including both mechanical and chemical breakdown of rocks. Understand how elements like frost wedging, thermal expansion, and plant growth contribute to the physical disintegration of rocks. This quiz will test your knowledge on regolith, soil, and the mechanisms involved in weathering.

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