Something Mysterious

What do we know about the Ocean?

An ocean (from Ancient Greek Ὠκεανός, transc. Okeanós, the sea of classical antiquity) is a body of saline water that composes much of a planet's hydrosphere. On Earth, an ocean is one of the major conventional divisions of the World Ocean, which covers almost 71% of its surface. These are, in descending order by area, the Pacific, Atlantic, Indian, Southern, and Arctic Oceans. The word sea is often used interchangeably with "ocean" in American English but, strictly speaking, a sea is a body of saline water (generally a division of the world ocean) partly or fully enclosed by land.As ships resume the search for missing Malaysian Airlines flight MH370 in the depths of the Indian Ocean this week, we often hear that the oceans are “95% unexplored” and that we know more about the surface of the Moon or Mars than the ocean floor. But is that true, and what do we really mean by “explored”?
Our knowledges about the Ocean

Opening this link, you can read more about our knowledges of the ocean.

Mapping The Ocean Floor(full documentary)