Answer:
The
Northern plains have been formed by three major river systems, namely the
Indus, the Ganga and the Brahmaputra, along with their tributaries. These
plains are formed of alluvial soil.
The deposition of alluvium in a vast basin lying at the foot hills of the
Himalayas over millions of years formed these fertile plains. With a rich soil
cover combined with adequate water supply and favourable climate, it is agriculturally
a very productive part of India.
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