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Difficulty: MediumLandform Evolution by Running Water and Underground Water

During upper-course fluvial erosion, rock fragments and coarse sediment carried by a river continuously grind against the riverbed and channel walls, scouring and wearing them down through mechanical friction. Which process of river erosion does this action describe?

  1. CorrasionAnswer
  2. B
    Attrition
  3. C
    Corrosion
  4. D
    Hydraulic action

Answer

Corrasion (abrasion) is the process of river erosion where transported rock fragments grind against and wear down the riverbed and banks.
Corrasion, also known as mechanical abrasion, takes place when boulders, pebbles, and sand particles trapped in the river current scrape, scour, and wear down the bed and banks of the river channel.

Step-by-Step Solution

1
Analyze the mechanism described in the stem
The stem describes mechanical grinding of the riverbed and banks using the river's sediment load as an abrasive agent.
Identifying whether the process involves load-on-channel friction, load-on-load collisions, chemical solution, or fluid pressure isolates the correct geomorphic term.
2
Distinguish corrasion from other fluvial erosion processes
Corrasion (abrasion) uniquely refers to load wearing away channel boundaries, whereas attrition is load wearing load, corrosion is solvent dissolving rock, and hydraulic action is fluid force alone.
Matching the definition to official Senior Secondary School (SSS) geography terminology ensures correct classification.

Key Concept

Fluvial Erosion Processes (Corrasion, Attrition, Corrosion, Hydraulic Action)
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Topics

Landform Evolution by Running Water and Underground Water

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