What is the average depth of an ocean?
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Facts about the Oceans\nArea: about 140 million square miles (362 million sq km), ore nearly 71% of the Earth's surface.\n\nAverage Depth: 12,200 feet (3,720 m).\n\nDeepest point: 36,198 feet (11,033 m) in the Mariana Trench in the western Pacific.\n\nMountains: The ocean ridges form a great mountain range, almost 40,000 miles (64,000 km) long, that weaves its way through all the major oceans. It is the largest single feature on Earth.\n\nHighest Mountain: Mauna Kea, Hawaii, rises 33,474 feet (10,203 m) from its base on the ocean floor; only 13,680 feet (4,170 m) are above sea level.
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Pacific Ocean - The deepest known point on Earth is at the bottom of the Mariana Trench, a depression in the floor of the western Pacific Ocean, just east of the Mariana Islands. \n\nThe Mariana Trench is 1,554 miles long and averages 44 miles wide. Within it, about 210 miles southwest of Guam, lies the deepest known point on Earth. Named the “Challenger Deep” for the British survey ship Challenger II that located it in 1951, this underwater gorge plunges to a depth of nearly 7 miles! It is deeper than Mt. Everest is tall.
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Asording to the U.S. NAVY the AVERAGE salinity for seawater. is between 37 and 40 PPM (parts per million)  the worlds oceans are constantly getting saltier though.\nsalinity of the ocean is important in calculating sound speed velocity.  which is important for submarines as well as ships that hunt submarines.\n\nWe    HAVE TO   know how SALTY the ocean is.
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The ocean is so deep that no one has made it to the bottom and lived as of yet. \n\nHow cool is that. There area so many kind of sea life we haven't discovered yet. Hay there may even be some very very big sea creatures down there ..... Woooooo wooooooo
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Sea level is considered to be the 0 point from which all land heights and sea bed depths are measured.\nHowever sea level changes over time. \nFactors which effect sea level include gravitational forces and sea level rises due to reduction of ice globally.\n\nSo it doesn't have a depth as it is considered the average point at the surface of the sea. \nEverything below sea level has depth.
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10,916 meters (35,814 feet), to Challenger Deep in the Marianas trench, which is the deepest known part of the Earth's oceans.  The Marianas trench is in the western north Pacific Ocean.  \n\nSee sources.
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5 oceans : from the largest to the smallest: the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Southern Ocean, and the Arctic Ocean.
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The density of seawater:\n\nhttp://hypertextbook.com/facts/2002/EdwardLaValley.shtml\n\nThe density of ice:\n\nhttp://www.elmhurst.edu/~chm/vchembook/122Adensityice.html\n\nThe figures for the world's volume of freshwater are available on a number of sites and in various texts.  Suffice to say that about 97% of the world's water is oceanwater, and some 80-90% of what's left over is frozen in the ice sheets.\n\n''With ice being significantly less dense than water will melted glaciers and ice mass really cause the ocean to rise? And even if that is so, would the volume of ice melting have to be incredibly dramatic to cause even a small rise?''\n\nDefinitely.  Sea ice will not contribute to rising sea level, but ice sequestered in glaciers will, because it was ultimately derived from the ocean.  The volume of melting would not have to be dramatic to make life interesting; if Greenland alone melted, that would raise sea level by some 20 feet.  A much smaller rise over the next century, of one to three feet, would still be disastrous for the most low-lying areas of the globe.
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It varies a bit since the earth isn't exactly round, but an average of 12755 km over the equator and about 12155 km over the poles is about right I think.
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it has to do with the depth of the ocean and how the sun is hitting it
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If you removed all the sponges, you would remove some of the mass in the ocean displacing water. So in fact, the ocean would not be deeper, but shallower. \n\nI will leave it to the reader to estimate the reduced depth after sponge removal.
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The average Ocean pH is slightly on the caustic side.\n\nThis enables the growth of coral reefs which are basically composed of Calcium Carbonate.\n\nCoral reefs provide a haven for marine life which in turn provides food for not only for other marine life but also provides food for humans.\n\nDeforestation by Third World countries contributes to the increase of atmospheric Carbon Dioxide which in turn makes the oceans more acidic.\n\nThis is far more that all the carbon dioxide produced by world industry.\n\nThis, unfortunately, is either not known or not admitted to, by the "Kumbaya" wing of the Democrats or the Major Media.
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How salty the ocean is, however, defies ordinary comprehension. Some scientists estimate that the oceans contain as much as 50 quadrillion tons (50 million billion tons) of dissolved solids.\nIf the salt in the sea could be removed and spread evenly over the Earth's land surface it would form a layer more than 500 feet thick, about the height of a 40-story office building.
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The Arctic. Its average depth is 3,407 feet.
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The Atlantic Ocean is the second largest of the world's five oceans (after the Pacific Ocean, but larger than the Indian Ocean, Southern Ocean, and Arctic Ocean).\n\nTotal Area: total: 76.762 million sq km\n\nIt is slightly less than 6.5 times the size of the US\n\nlowest point: Milwaukee Deep in the Puerto Rico Trench -8,605 m \nhighest point: sea level 0 m\n\nExtent and Seas\n\nThe Atlantic Ocean extends in an S shape from the arctic to the antarctic regions between North and South America on the west and Europe and Africa on the east. It is connected with the Arctic Ocean by the Greenland Sea and Smith Sound; with the Pacific Ocean by Drake Passage, the Straits of Magellan, and the Panama Canal; and with the Indian Ocean by the Suez Canal and the expanse between Africa and Antarctica. The shortest distance across the Atlantic Ocean (c.1,600 mi/2,575 km) is between SW Senegal, W Africa, and NE Brazil, E South America. The principal arms of the Atlantic Ocean are Hudson and Baffin bays, the Gulf of Mexico, and the Caribbean Sea in the west; the Baltic, North, Mediterranean, and Black seas in the east; and the Weddell Sea in the south. More large rivers, including the Mississippi, the Congo, and the Amazon, drain into the Atlantic than into any other ocean.\n\nOcean Floor\n\nThe floor of the Atlantic has an average depth of c.12,000 ft (3,660 m). It is separated from that of the Arctic Ocean by a submarine ridge extending from SE Greenland to N Scotland; part of the floor (c.3,000 ft/910 m deep) is known as “telegraph plateau” because of the network of cables laid there. A shallow submarine ridge across the Strait of Gibraltar separates the Mediterranean basin from the Atlantic and limits the exchange of water between the two bodies. The Mid-Atlantic Ridge (c.300–600 mi/480–970 km wide), a submarine mountain range extending c.10,000 mi (16,100 km) from Iceland to near the Antarctic Circle, generally follows the trend of the coastlines of the continents. It rises to an average height of c.10,000 ft (3,050 m), and a few peaks emerge as islands. The ridge, which is the center of volcanic activity and earthquakes, has a great rift that is constantly widening (see seafloor spreading) and filling with molten rock from the earth's interior. As a result the Western Hemisphere and Europe and Africa are moving away from each other. The Mid-Atlantic Ridge divides the floor of the Atlantic Ocean into eastern and western sections that are composed of a series of deep-sea basins (abyssal plains). The greatest depth (c.28,000 ft/8,530 m) is the Milwaukee Deep, in the Puerto Rico Trench, N of Puerto Rico. Scientific knowledge of the ocean floor dates from the Challenger expedition (1872–76).
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rekn may be right, but from what information we have, including satellite surveys, the deepest knows ocean is the pacific ocean with an average depth of 4270 m (14000 ft). the deepest point on the pacific is the mariana trench at 10 911 metres (35,797 ft) below sea level, it is also the deepest know point on the surface of earth
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Smallest Ocean:\n\nThe Arctic Ocean, with an area of 9,485,000 sq km (3,662,000 sq miles), is the smallest ocean. It has a maximum depth of 5,450 m (17,880 ft). The Arctic Ocean is not completely enclosed by land, however, and so is sometimes referred to as an arm of the Atlantic. It is also connected to the waters of the Pacific Ocean by the Bering Strait.\n\nThe Arctic Ocean is ten times smaller than the Pacific Ocean, and has about 1.5 times the surface area of the United States. It is the smallest of the four oceans, and is almost completely surrounded by land at the top of the globe.