Question

Explain the formation of the northern plains of India

Answer 1

Northern plains are formed by the deposit bought by the three major rivers:
1)THE INDUS 
2)THE BRAHMAPUTRA
3)THE GANGA
alluminium was deposited at the foot hills of himalayas for million of years,it resulted in formation of the great northern plains.
Alluminium is soil or sediment  deposited by a river alluvium is made of fine particles like silt and clay large particles of sand and gravel.This area is rich in watre resources and for irrigation.
The northern plains are 7 lakhs s,q k.m in size 2400 km long 240 k.m  broad.The crops grown are rice,wheat etc...they are grown in rotation.
DIVISION OF NORTHERN PLAINS :
1)THE INDUS PLAIN
2)THE GANGA PLAIN 
3)THE BRAHMAPUTRA PLAIN
INDUS PLAIN:
                      The major part of the indus plain lies in pakistan,punjab,haryana etc...The main tributaries of indus are chenab,ravi,beas,sutlej.All these tributaries stsrt from the himalayas,.
THE GANGA PLAIN:
The ganga plain lies between ghagar and teesta river it extend sover haryana,delhi,west bengal,u.p,bihar,jharkhand.It flows through northern plains india into bangladesh.The 2510 km long river begins at gangotri glacier in uttarkhand in the central himalayas and drains into the bay of bengal through the sundarbans .
THE BRAHMAPUTRA:
The brahmaputra plains are fed by river brahmaputra and its tributaries .The plain mostly comprised of the flat land.The distinctive features of plain ars bhabar,terai,bhangar,khadar.
The northern plain is most populated area because of its fertile land useful for agriculture.

Answer 2

The Northern Mountains plain are formed by the deposition of alluvium by the rivers flowing from the Northern Mountains and the Peninsular Plateau. The alluvial deposits are hundreds of meters in thickness and form fertile soils. These plains extend for a distance of about 2500km from Punjab in the west to the Brahmaputra Valley in the east.