it causes the difference in density, denser water flows to the less dense parts
denser, due to the decrease in temperature causing the water molecules to contract and become more tightly packed. This increased density causes the cold water to sink to the bottom of the ocean, creating ocean currents as it displaces warmer, less dense water.
ocean water, because it is saltier.
Ocean crust is denser
Sea water is denser, not only that, different oceans have different densities.
The ocean is stratified with denser layers below less dense layers.
because it is colder up there
The water of the oceans is denser because of the high level of salt it contains.
The water gets cooler
sinks
When seawater freezes the salt is excluded from the ice and stays with the portion that remains liquid. The result is highly saline water called brine. The brine is denser than normal seawater and so sinks the the ocean floor, forming deep currents.
it is cold, dark and freezing