Question

why are alluvial plains so fertile ?

Answer 1

Rivers carry along with them eroded material like fine soil and sediments. When it overflows its banks, it deposits the eroded material and causes flood plains to be formed. The deposited material makes the land fertile. Plainsare formed by the alluvial deposits of the river which increases the fertility of the soil.

Answer 2

Rivers carry along with them eroded material like fine soil and sediments. When it overflows its banks, it deposits the eroded material and causes flood plains to be formed. The deposited material makes the landfertile. Plains are formed by the alluvial deposits of the river which increases thefertility of the soil.
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