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→International Hydrographic Organization deems Southern Ocean to be the fifth ocean in the world
Some consider the Arctic, Atlantic, Indian, and Pacific to be the world's four oceans. Now, those that side with the number five can add the fifth new ocean and call it the Southern Ocean or the Antarctic Ocean, thanks to the International Hydrographic Organization (IHO).<ref>[https://www.thoughtco.com/the-new-fifth-ocean-1435095 The New Fifth Ocean]</ref>}}
Some consider the Arctic, Atlantic, Indian, and Pacific to be the world's four oceans. Now, those that side with the number five can add the fifth new ocean and call it the Southern Ocean or the Antarctic Ocean, thanks to the International Hydrographic Organization (IHO).<ref>[https://www.thoughtco.com/the-new-fifth-ocean-1435095 The New Fifth Ocean]</ref>}}
The website Windows to the Universe further explains:
{{Cquote|So what makes the Southern Ocean an ocean?
According to the International Hydrographic Organization (IHO), because of its distinct circulation pattern, the waters of the Southern Ocean are somewhat separated from other oceans even without continents to form borders. The Antarctic Circumpolar Current is the strong ocean current that circles eastward around Antarctica. Because of this ocean circulation pattern, the seawater in the Southern Ocean is colder. The colder and isolated water supports a [https://www.windows2universe.org/earth/polar/antarctic_marine_life.html unique marine ecosystem in the Antarctic].<ref>[https://www.windows2universe.org/earth/polar/southern_ocean.html So what makes the Southern Ocean an ocean?], Windows to the Universe website</ref>}}
== History of exploration of the Southern Ocean ==
== History of exploration of the Southern Ocean ==