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Difficulty: EasyPhysiography and Relief Features of India

Which of the following physiographic sub-regions of the Northern Plains of India is a narrow belt composed of pebble deposits brought down by rivers from the Shiwaliks, where streams frequently disappear under the surface?

  1. BhabarAnswer
  2. B
    Terai
  3. C
    Bhangar
  4. D
    Khadar

Answer

Bhabar is the narrow belt of pebble deposits lying along the foothills of the Shiwaliks where rivers disappear into porous rock deposits.
Bhabar is a narrow belt of about 8 to 16 km width running parallel to the Shiwalik foothills. It is composed of porous pebble deposits left by streams breaking off from the hills. Due to the high porosity of these boulder and pebble beds, smaller streams sink and flow sub-surface.

Step-by-Step Solution

1
Identify the physiographic zones of the Northern Plains from north to south near the foothills.
The zones are ordered as Bhabar at the immediate foothills, followed by Terai to the south, and Bhangar/Khadar along river basins.
Relief features in the Northern Plains vary systematically according to grain size, gradient, and river deposition.
2
Match the specified geological and physical characteristic (narrow pebble belt, river disappearance).
Bhabar is formed by heavy pebble and rock debris deposited by high-velocity streams emerging from the mountains, creating high porosity that causes small streams to flow underground.
Coarse sediment at the slope break creates high porosity.

Key Concept

Physiographic divisions of the Northern Plains of India (Bhabar, Terai, Bhangar, Khadar)
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Topics

Physiography and Relief Features of India

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