Translations:AY Honors/Oceans/Answer Key/35/en
From Pathfinder Wiki
Deep ocean currents (the global conveyor belt) are driven by the density of the water. The more salt in the water the denser it becomes. When water freezes at the poles it leaves the salt behind creating a large amount of dense, cold water that eventually sinks allowing more water to replace it. This causes a current that eventually goes around the entire world.
