Photo: NASA Goddard Space Flight Center (Some rights reserved)
In a sense, there is only one ocean covering 72% of the planet. One planet, one ocean. That said five oceanic divisions are usually reckoned: Pacific, Atlantic, Indian, Arctic, and Southern; the last two listed are sometimes consolidated into the first three. What’s most important to note is that more than 95% of the underwater world remains unexplored.
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https://www.herox.com/bigoceanbutton/40-winners
https://www.media.mit.edu/events/here-be-dragons/
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