World Ocean

The World Ocean, world ocean, or global ocean is the interconnected system of the Earth's oceanic (or marine) waters, and comprises the bulk of the hydrosphere, covering almost 71% of the Earth's surface.
The unity and continuity of the World Ocean, with relatively free interchange among its parts, is of fundamental importance to oceanography.[1] It is divided into a number of principal oceanic areas that are delimited by the continents and various oceanographic features: these divisions are the Atlantic Ocean, Arctic Ocean (sometimes considered a sea of the Atlantic), Indian Ocean, Pacific Ocean, and Southern Ocean (sometimes reckoned instead as just the southern portions of the Atlantic, Indian, and Pacific Oceans). In turn, oceanic waters are interspersed by many smaller seas, gulfs, and bays.
A global ocean has existed in one form or another on Earth for eons, and the notion dates back to classical antiquity (in the form of Oceanus). The contemporary concept of the World Ocean was coined by the Russian oceanographer Yuly Shokalsky in the early 20th century to describe what is basically a solitary, continuous ocean that covers and encircles most of the Earth.

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The Western Hemisphere, also Western hemisphere[1] or western hemisphere,[2] is a geographical term for the half of the Earth that lies west of the Prime Meridian (which crosses Greenwich, London, United Kingdom), the other half being the eastern hemisphere.[3] It is also used, mainly in North America, to specifically refer to the Americas (or the New World) and adjacent waters, while excluding other territories that lie geographically in Western Hemisphere (parts of Africa, Europe, Antarctica, and Asia); thus, it is sometimes referred to as the American hemisphere.[4]

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