Question

the northern plains are formed​

Answer 1

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$\textsf{The northern plain of India is formed by three river systems, i.e. the Indus, }$$\textsf{the Ganga and the Brahmaputra; along with their tributaries.}$ $\textsf{The northern plains are the largest alluvial tract of the world}$. $\textsf{These plains extend approximately 3200 km from west to east.}$

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Answer 2

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The northern plains are mainly formed by the alluvial deposits. The northern plain has been formed by the interconnection of the three major river systems. They are the Indus, the Ganga and the Brahmaputra along with their tributaries. This plain is completely formed of alluvial soil.