Answer:
The Northern plain has been formed by
the interplay of the Indus, the Ganges and the Brahmaputra along with their
tributaries. In due course of time, this depression gradually got filled with
deposition of sediments by the rivers flowing from the lofty mountains and the peninsular
plateau.
A flat land of extensive
alluvial deposits resulted in the formation of the Northern plains of India. It
spreads over an area of 7 lakh sq. km. The plain being about 2400 km long and
240 to 320 km broad and is a densely populated area. (3)
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