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# The process which is responsible for the formation of delta at a place where river meets the sea is(A)Colloid formation(B)Peptization(C)Emulsification(D)Coagulation

Last updated date: 25th Mar 2023
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River water is a colloidal solution that contains clay, mud, sand, sediments and pebbles whereas sea water is rich in electrolytes. As the river meets the sea, larger particles like sand, mud and pebbles settle down. Clay is negatively charged and has the size in the colloidal range. It forms colloidal sol – solid dispersed in liquid (dispersion medium). Sea water contains many positive electrolytes like $N{a^ +}$ which neutralises the negatively charged clay leading to a process called coagulation. The process of settling down of colloidal particles is known as coagulation or precipitation of sol. As a result of coagulation, large neutral particles get accumulated and they settle down. This leads to the formation of delta.