When the salinity of an ocean is high, the ocean water is denser than water with lower salinity. This is because the dissolved salts in the water increase its density. As a result, the high salinity water tends to sink and flow towards the bottom of the ocean, towards areas with lower salinity. This movement of water helps to mix the ocean and distribute heat and nutrients throughout the water column.
So, the correct option is:
- the ocean water is dense and creeps at the bottom of the ocean towards low salinity areas.