When river water containing colloidal clay flows into the sea, the major cause of silting is……
(1) accumulation of sand at the bottom
(2) flocculation and coagulation
(3) decreased salinity of sea water
When river water containing colloidal Clay flows in to the sea, the salt present in sea-water neutralised the charged colloidal particles of river water, produces silt. This phenomenon is flocculation and coagulation.