Final answer:
The coldest, deepest, densest water in the oceans that is formed around Antarctica and flows north is called bottom water.
Step-by-step explanation:
The coldest, deepest, densest water in the oceans that is formed around Antarctica and flows north is called bottom water. This bottom water is created when the cold, dense water from the Southern Ocean sinks below the warmer waters from the Pacific, Atlantic, and Indian Oceans, creating a zone of upwelling and mixing.
Bottom water is responsible for high levels of productivity for organisms like phytoplankton and krill.