Which of the following is the LEAST visible form of land erosion?

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SSC CGL 2021 Tier-I (Held On : 20 April 2022 Shift 2)
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  1. Gully erosion
  2. Landslides
  3. Sheet erosion
  4. Ravine formation

Answer (Detailed Solution Below)

Option 3 : Sheet erosion
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PYST 1: SSC CGL - English (Held On : 11 April 2022 Shift 1)
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Detailed Solution

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The correct answer is Sheet erosion.

Key Points

  • Sheet erosion is the LEAST visible form of land erosion.
  • Sheet erosion is the process of uniform removal of soil in thin layers by the forces of raindrops on land.
  • It is caused by the force of rainfall.
  • It takes place in levelled lands and plowed fields after a heavy shower and the soil, removal is not easily noticeable, but it is harmful since it removes the finer and more fertile topsoil.

Additional Information

  • Rill and gully erosion:
    • In rill erosion, finger-like rills appear on the cultivated land after it has undergone sheet erosion.
    • These rills are usually smoothened out every year while forming.
    • Each year the rills slowly increase in number and become wider and deeper.
    • Gully erosion is the removal of soil along drainage lines by surface water runoff.
    • When rills increase in size, they become gullies.
    • Once started, gullies will continue to move by headward erosion or by slumping of the side walls.
    • Gullies formed over a large area give rise to badland topography (Chambal Ravines).
    • When a gully bed is eroded further due to headward erosion, the bed gradually deepens and flattens out, and a ravine is formed.
    • The depth of a ravine may extend to 30 meters.
  • Landslides
    • Landslides and slope instability cause problems in many parts of the world.
    • A landslide is primarily a combination of several geological processes that include physical factors like earth movements like extensive slope failure, rocks falling, and debris flow.
    • These ground movements may take place in a coastal, offshore, or far onshore environment.
    • Gravity, in addition to other factors that affect ground stability, is the main force that causes landslides.
    • Normally, the ground characteristics develop particular sub-surface soil conditions that cause slope failure.
    • However, the real landslide needs a trigger before it can be initiated. It is normally feasible to recognize the main landslide origin and the landslide triggers.
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