Answer:
(i) The northern plains have been formed by
the interplay of the three major river systems?the Indus, the Ganga and the
Brahmaputra along with their tributaries.
(ii)
The deposition ofallumium in a vast basin lying at the foothills of the
Himalayas over millions of years, formed this fertile plain.
(iii)
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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