Describe how temp. & density cause ocean water to cycle from warmer regions of the ocean to cooler?

Essential to Earth’s “Air Conditioner”
Oceans cover about 70 percent of the earth, giving them a major role in climate control. therefore, oceans and atmosphere are practically one, constantly exchanging heat, water, gases, and momentum in the form of wind and waves. They also work together carrying solar heat away from the Tropics toward the poles, there by moderating global temperatures. In fact, for most organisms to survive, temperatures must stay within the range that allows water to remain a liquid.
In a number of remarkable ways, the water of the oceans was designed to sustain life. For example, water has the capacity to store heat. The oceans act as a huge heat reservoir, moderating the frigid cold of winter. Origin of Sea Life Genesis 1:20-23.

For more information on this subject and others, please go to the source jw.org official website.
.