Q. Consider the following statements about the Indus, the Ganga and the Brahmaputra Plains:

1. Originally, it was a geo-synclinal depression which attained its maximum development during the third phase of the Himalayan mountain formation approximately about 64 billion years ago.
2. Average depth of alluvial deposits in these plains ranges from 1,000-2,000 m.

Which of the above is / are correct?
Answer: Only 2
Notes: Originally, it was a geo-synclinal depression which attained its maximum development during the third phase of the Himalayan mountain formation approximately about 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.

This question is part of UPSC Daily 20 MCQ Series Course on GKToday Android app.