Question

Howflood plain formed
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Answer 1

Answer:

When it floods, it deposits a layer of fine soil, rich mineral salts, nutrient-rich silt, sediment, and distribute it across a wide area. These sediments make the soil very much fertile and lead to the formation of a very flat fertile flood plain.

Answer 2

Answer:

In the lower course of the river heavy deposition of sand ,silt ,stones etc., take place on the river bed and the channel become shallow.In rainy season when flood occurs widespread deposition of alluvium takes place .The gradually fill up the low-lying areas of both the bank of a river and build up plain .These are known as flood plains.