Ocean water is constantly in motion: north-south, east-west, alongshore, and vertically. Around 70% of the planet’s surface is covered by oceans. They are deepest parts of the ocean floor and usually 5500 metres deep. (Physical Geography) the body of salt water covering approximately 70 per cent of the earth's surface. Physical Geography. Arctic Ocean. Oceans serve as the planet’s largest habitat and also help to regulate the global climate. Jeanna Sullivan, National Geographic Society, Sarah Appleton, National Geographic Society An ocean is a huge body of salt water. noun. you would have a total area of the ocean of about 361,000,000 km² (which is ~71% of the Earth’s surface), a total volume of roughly 1,370,000,000 km³, and an average depth of 3,790m. On the other hand, the Atlantic Ocean is relatively shallow because large parts of its seafloor are made up of continental shelves—parts of the continents that extend far out into the ocean. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. 1145 17th Street NW When the geography of some past time is analyzed—for example, the geography of England in 1800—such studies are referred to as historical geographic studies. Collecting and analyzing long-term ocean data from satellites is a relatively new field of exploration. The ocean floor is divided into several different areas. As stated earlier, oceans are large water bodies that exist on the earth's surface. Oceanography is the study of all aspects of the ocean. In recent years, some oceanographers have determined that the seas around Antarctica deserve their own designation: the Southern Ocean. b : any of the large bodies of water (such as the Atlantic Ocean) into which the great ocean is divided. Currently, scientists know of around 226,000 ocean species. Introduction to Ocean Deposits 2. More than 80 percent of the ocean has never been mapped, explored, or even seen by humans. It is formed where the Roanoke and Chowan Rivers join together. Search for: Waves. The oceans crust is a thin layer of volcanic rock called basalt. What does ocean mean? But that number includes water bodies not always thought of as seas, such as the Gulf of Mexico and the Hudson Bay. There is one world ocean, but it is divided into five main areas: the Pacific, the Atlantic, the Indian, the Arctic, and the Southern, or Antarctic. Oceans and Coastal Environments. Distribution. Seas are smaller than oceans and are usually located where the land and ocean meet. Margot Willis, National Geographic Society. Terms of Service | The Atlantic Ocean is the second-largest of the Earth's oceans. For example, we know that the ocean contains towering mountain ranges and deep canyons, known as trenches, just like those on land. Ocean, continuous body of salt water held in enormous basins on Earth’s surface. This connected body of water surrounds the continents and is divided into five major regions: the Pacific, Atlantic, Indian, Arctic, and Southern oceans. There are five different oceans, the Pacific Ocean being the largest with a depth of around 10,924 meters, and the Arctic Ocean is the smallest with a depth of 5,625 meters. Sustainability Policy | She or he will best know the preferred format. On Earth, an ocean is one of the major conventional divisions of the World Ocean.These are, in descending order by area, the Pacific, Atlantic, Indian, Southern (Antarctic), and Arctic Oceans. Though the oceans cover more than 70 percent of Earth, only 20 percent is visible to us. See more. The first is the continental shelf, the nearly flat, underwater extension of a continent. As such, it is regarded as the second-smallest of the five principal oceanic divisions: smaller than the Pacific, Atlantic, and Indian oceans but larger than the Arctic Ocean. field of robotics that specializes in creating robots that operate like living organisms. ADVERTISEMENTS: After reading this article you will learn about the meaning of trench. Covering approximately 20 percent of globe's surface, the Atlantic is second only to the PACIFIC OCEAN in size. Our oceans play a major role in influencing changes in the world's climate and weather. National Geographic Headquarters They contain almost 98 percent of all the water on Earth. [1250–1300; Middle English (< Old French) < Latin < Greek. The ocean is a huge body of saltwater that covers about 71 percent of the Earth’s surface. Code of Ethics. So we are usually only able to see the water at the surface, not most of it, the other 80 percent, below. Learning more about the seafloor and the rest of the ocean is the passion of National Geographic Explorer Marcello Calisti. An estimated 97 percent of the world’s water is found in the ocean. Privacy Notice | And again the goddess murky Night, though she lay with none, bare Blame and painful Woe, and the Hesperides who guard the rich, golden apples and the trees bearing fruit beyond glorious, When gliding by the Bashee isles we emerged at last upon the great South Sea; were it not for other things, I could have greeted my dear Pacific with uncounted thanks, for now the long supplication of my youth was answered; that serene, Out of the school perhaps he would reach a score of the leviathans, his bullets biting into them like whip-lashes, so that each, like a colt surprised by the stock-whip, would leap in the air, or with a flirt of tail dive under the surface, and then charge madly across the, Pallidly the moon was shining On the dewy meadows nigh; On the silvery, silent rivers, On the mountains far and high On the, The spot where the projectile sank under the waves was exactly known; but the machinery to grasp it and bring it to the surface of the, The narrow seas around these isles, where British admirals keep watch and ward upon the marches of the Atlantic, Even at this day, if the Malay Archipelago were converted into land, the tropical parts of the Indian, The wind blew hard and joggled the water of the, Some gamesome wights will tell you that they have to plant weeds there, they don't grow naturally; that they import Canada thistles; that they have to send beyond seas for a spile to stop a leak in an oil cask; that pieces of wood in Nantucket are carried about like bits of the true cross in Rome; that people there plant toadstools before their houses, to get under the shade in summer time; that one blade of grass makes an oasis, three blades in a day's walk a prairie; that they wear quicksand shoes, something like Laplander snowshoes; that they are so shut up, belted about, every way inclosed, surrounded, and made an utter island of by the, the beautiful sight of the calm ocean on a warm night, Dictionary, Encyclopedia and Thesaurus - The Free Dictionary, the webmaster's page for free fun content, Occupational Safety and Health Administration, Ocean & Coastal Interdisciplinary Science, Ocean Acoustical Services and Instrumentation Systems, The Alvin [a ship] … moved through the dark sea like a robot fish —Richard Moran, The beach is bare as the blue bowl of the sky —John Hall Wheelock, The beach was splattered with people like bright rags —Nadine Gordimer, (Here in front of the summer hotel) the beach waits like an altar —Anne Sexton, A beach, white and slender like a young moon —Louis Bromfield, A breaker … roaring over the reef like a herd of crazed animals running before a forest fire —Clive Cussler, The gentle surf crested in the quick darkness with swirling phosphorous fringes of tiny animals like liquid silver —James Crumley, Long blue rollers coming in … each a neat and level line like an ironed crease —George Garrett, The ocean frowns like elephant hide —Karl Shapiro, The ocean like sleek gray stone —Robinson Jeffers, The ocean looked like a wide lavender ribbon stitched up against a pink-and-blue sky —Sue Grafton, The ocean rumbled like a train backing up —Anne Sexton, The ocean seemed to hover in the distance like a gray haze blending into the gray of the sky —Sue Grafton, The rough white crests of waves walk as if in moccasins —Diane Wakoski, The sea growled like a dog —John Mortimer, The sea has that oily sheen to it, like an empty swimming pool —William Boyd, The sea is like a human being … always moving, always something deep in itself stirring it … always wanting —Olive Shreiner, The sea [along the beach jetties] trembling among the stones like gelatin —Thomas McGuane, The sea whispered and hummed like a great shell held to the ear —Mary Stewart, The surf hisses like tambourines —Derek Walcott, The tide came in like ten thousand orgasms —Anne Sexton, The water ran over the sand, one wave covering another like the knitting of threads —Rachel Ingalls, Waves … black as cypresses, clear as the water of a wishing well —Denise Levertov, Waves crashing with the sound as of breaking biscuits —Vita Sackville-West, Waves … leaping like hounds up at the rocks —Josephine Jacobsen, Waves like small mountains rose with the shrieking wind into the black sky —James Stern, A wave like a vast castle —Arabian Nights, Waves, like blue animals stampeding —George Garrett, Waves like white feathers —George Garrett, The waves pulse … like hearts —Sylvia Plath, A wave suddenly raged out like a mountain cat —Stephen Crane, Waves that rose like mountains —D. 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