The water in the deep ocean is denser than the surface water because of the overlying weight of the water that pushes downward, as a result of which the pressure exerted on the deep ocean water is extremely high.
The temperature of the deep ocean water is low because sunlight cannot penetrate into the deeper zone. In addition to this, the deeper ocean water is comprised of high salinity that increases the density.
Thus, within an ocean body, the deeper water is denser than the surface water.
Water in the deep ocean is more dense water than the surface layer. Naturally, more dense fluids and solids will be on the bottom and less dense fluids and solids will flow to the top.
