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Difficulty: MediumLandform Evolution by Running Water and Underground Water

A river undergoes rejuvenation when its erosive energy is renewed due to a fall in sea level or tectonic uplift of the land. Which of the following landforms is formed as a direct result of river rejuvenation?

  1. River terracesAnswer
  2. B
    Oxbow lakes
  3. C
    Sinkholes
  4. D
    Exfoliation domes

Answer

River terraces
River terraces are step-like benches abandoned above a new valley floor when a river experiences rejuvenation, providing it with renewed energy to erode vertically into its former floodplain.

Step-by-Step Solution

1
Identify the primary geomorphological trigger described in the stem.
The trigger is river rejuvenation caused by base-level lowering or land uplift.
Rejuvenation increases the stream's gradient and potential energy, triggering renewed vertical downcutting.
2
Analyze how active downcutting affects existing valley features.
The river incision carves a deep inner valley into its old floodplain, leaving step-like benches along the valley sides.
These step-like features, known as paired or unpaired river terraces, mark the former levels of the valley floor before rejuvenation occurred.

Key Concept

River Rejuvenation and Terrace Formation
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Topics

Landform Evolution by Running Water and Underground Water

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