Answer: Option [D]The correct answer is Colorado River. Grand Canyon is in the northwest corner of Arizona, close to the borders of Utah and Nevada. The Colorado River, which flows through the canyon, drains water from seven states, but the feature we know as Grand Canyon is entirely in Arizona.
Answer: Option [C]The sea bed sloping gradually and bordering the continent is known as Continental Shelf. The continental shelf is the extended perimeter of each continent and associated coastal plain. Much of the shelf was exposed during glacial periods, but is now submerged under relatively shallow seas (known as shelf seas) and gulfs, and was almost similarly submerged during other interglacial periods.
Answer: Option [B]The correct answer is Atlantic Ocean. The Atlantic Ocean is the second-largest ocean in the world. It is "S" shaped and roughly bounded by the North and South Americas on the western side, and Europe and Africa on the eastern side.
Answer: Option [C]The correct answer is Aral Sea. The Aral Sea was an endorheic lake lying between Kazakhstan and Uzbekistan. The name roughly translates as "Sea of Islands", referring to over 1,100 islands that had dotted its waters.
Answer: Option [B]A place where there is constant intermingling of salt water and fresh water is Estuary. 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.