Question

What increases the salinity of the ocean surface water, causing it to sink

downward?
Help

Answer 1

Thermohaline Circulation

Step-by-step explanation:

The process is known as “Thermohaline Circulation”. In the Earth’s polar regions ocean water gets very cold, forming sea ice. As a consequence the surrounding seawater gets saltier, because when sea ice forms, the salt is left behind. As the seawater gets saltier, its density increases, and it starts to sink.