Question

How the Ganga and the Bramaputra plains formed?
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Answer 1

Answer:

The Great Plains is a depositional surface of great extent formed after the Himalayas. ... The crescent of alluvium, from the Ganga Brahmaputra delta in the east to the Indus delta in the west, probably represents the infilling of a fore deep warped down between the peninsular block and advancing Himalayas.

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Answer 2

Answer:

by the alluvial soils brought by rivers..☺️