Monday, July 26, 2010

Oceans of the World

Names Area (Sq.Km) Greatest Depth Pacific 166,240000- Mariana Trench

Atlantic 86,560000 Puerto Rico Trench

Indian 73430000 Java Trench

Arctic 13230000

The World Ocean, world ocean, or global ocean is the interconnected system of the earth's oceanic waters, and comprises the bulk of the hydrosphere, covering almost 71% of the Earth's surface.

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.

  • the Pacific Ocean, the largest of the oceans, also reaches northward from the Southern Ocean to the Arctic Ocean. It spans the gap between Australia, Asia, the Americas and Oceania. The Pacific Ocean meets the Atlantic south of South America at Cape Horn.

  • The Indian Ocean extends northward from the Southern Ocean to India, between Africa and Australia. The Indian Ocean joins the Pacific Ocean to the east, near Australia.

  • The Southern Ocean is the ocean surrounding Antarctica, dominated by the Antarctic Circumpolar Current, generally the ocean south of sixty degrees south latitude. The Southern Ocean is partially covered in sea ice, the extent of which varies according to the season. The Southern Ocean is the second smallest of the five named oceans.

  • The Arctic Ocean is the smallest of the five. It joins the Atlantic near Greenland and Iceland, and joins the Pacific at the Bering Strait. It overlies the North Pole, touching North America in the Western hemisphere and Scandinavia and Asia in the Eastern hemisphere. The Arctic Ocean is partially covered in sea ice, the extent of which varies according to the season. Some authorities do not consider the Arctic Ocean a bona fide ocean, because it is largely surrounded by land with only limited exchange of water with the other oceans. Consequently, it is considered by some to be a sea of the Atlantic, referred to as the Arctic Mediterranean Sea or Arctic Sea.

The approximate shape of the World Ocean can for most purposes be treated as constant, although in fact it is not: continental drift continually changes its structure.

Further north, the Atlantic opens into the Arctic Ocean, which is connected to the Pacific by the Bering Strait:

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