Question
Download Solution PDFWhich of the following is the LEAST visible form of land erosion?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe 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.
Last updated on Jun 11, 2025
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