Q. Consider the following statements regarding “Indo-Ganga-Brahmaputra Plain”:
1.It was a geo-synclinal depression.
2.It has been gradually filled by the sediments brought by the Himalayan and Peninsular rivers.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: C
Notes:

Explanation: The third geological division of India comprises the plains formed by the river Indus, the Ganga and the Brahmaputra.

  • Originally, it was a geo-synclinal depression which attained its maximum development during the third phase of the Himalayan Mountain formation approximately 64 million years ago.
  • Since then, it has been gradually filled by the sediments brought by the Himalayan and Peninsular rivers. Average depth of alluvial deposits in these plains ranges from 1,000-2,000 m.

Source: NCERT

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