Answer (Detailed Solution Below)

Option 4 : The US
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RRB NTPC CBT-I Official Paper (Held On: 4 Jan 2021 Shift 1)
100 Qs. 100 Marks 90 Mins

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The correct answer is The US.

  • The Grand Canyon is an example of a valley that is an erosional landform.
    • Erosion - It is the geological process in which earthen materials such as soil or rock are removed and transported by natural forces such as wind or water.
      • Valleys start as small and narrow rills.
      • The rills will gradually develop into long and wide Gullies.
        • A rill means a small stream.

  • The gullies will further deepen, widen, and lengthen to give rise to valleys.
    • Gully - A small passage formed due to stream.

  • Depending upon dimensions and shape, many types of valleys like V-shaped valleys, gorge, canyon, etc. can be recognised.
    • V-shaped valley 

  • A canyon is characterised by steep steplike side slopes.
  • A canyon is wider at its top than at its bottom. In fact, a canyon is a variant of a gorge.
  • Valley types depend upon the type and structure of rocks in which they form.
    • Example canyons commonly form in horizontal bedded sedimentary rocks and gorges form in hard rocks.
  • The Grand Canyon :

  • Gorge - A narrow valley with steep sides and a river running through it.

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