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GS Geography Physical Geography of World
Q.

A place where there is constant intermingling of salt water and fresh water is   
Explanation:

ANS. (A) 
Estuaries form a transition zone between river environments and ocean environments and are subject to both marine influences, such as tides, waves, and the influx of saline water; and riverine influences, such as flows of fresh water and sediment. The inflow of both seawater and freshwater provide high levels of nutrients in both the water column and sediment, making estuaries among the most productive natural habitats in the world.

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