The Global Ocean Conveyor moves water slowly, 10 cm per second at most, but it moves a lot of water. One hundred times the amount of water that is in the Amazon River is being transported by this huge slow circulation pattern. The water moves mainly because of differences in relatively density. Water that is more dense sinks below water that is less dense. Two things affect the density of seawater: temperature and salinity.
source:
youtube
Taipei Time