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The World Ocean is the habitat of , known species , but because much of it is unexplored, the number of species that exist in the ocean is much larger, possibly over two million.
Extraterrestrial oceans may be composed of water or other elements and compounds. The only confirmed large stable bodies of extraterrestrial surface liquids are the lakes of Titan , although there is evidence for the existence of oceans elsewhere in the Solar System.
Early in their geologic histories, Mars and Venus are theorized to have had large water oceans. The Mars ocean hypothesis suggests that nearly a third of the surface of Mars was once covered by water, and a runaway greenhouse effect may have boiled away the global ocean of Venus.
Compounds such as salts and ammonia dissolved in water lower its freezing point so that water might exist in large quantities in extraterrestrial environments as brine or convecting ice.
Unconfirmed oceans are speculated beneath the surface of many dwarf planets and natural satellites; notably, the ocean of the moon Europa is estimated to have over twice the water volume of Earth.
The Solar System's giant planets are also thought to have liquid atmospheric layers of yet to be confirmed compositions. Oceans may also exist on exoplanets and exomoons , including surface oceans of liquid water within a circumstellar habitable zone.
Ocean planets are a hypothetical type of planet with a surface completely covered with liquid. Related to this notion, the Okeanos is represented with a dragon-tail on some early Greek vases.
Though generally described as several separate oceans, the global, interconnected body of salt water is sometimes referred to as the World Ocean or global ocean.
The major oceanic divisions — listed below in descending order of area and volume — are defined in part by the continents , various archipelagos , and other criteria.
Oceans are fringed by smaller, adjoining bodies of water such as seas , gulfs , bays , bights , and straits. The mid-ocean ridges of the world are connected and form a single global mid-oceanic ridge system that is part of every ocean and the longest mountain range in the world.
The total mass of the hydrosphere is about 1. The area of the World Ocean is about The bluish ocean color is a composite of several contributing agents.
Prominent contributors include dissolved organic matter and chlorophyll. In , scientists announced that for the first time, they had obtained photographic evidence of this glow.
Oceanographers divide the ocean into different vertical zones defined by physical and biological conditions.
The pelagic zone includes all open ocean regions, and can be divided into further regions categorized by depth and light abundance.
Because plants require photosynthesis , life found deeper than the photic zone must either rely on material sinking from above see marine snow or find another energy source.
The pelagic part of the photic zone is known as the epipelagic. The pelagic part of the aphotic zone can be further divided into vertical regions according to temperature.
The mesopelagic is the uppermost region. The last zone includes the deep oceanic trench , and is known as the hadalpelagic.
The benthic zones are aphotic and correspond to the three deepest zones of the deep-sea. Lastly, the hadal zone corresponds to the hadalpelagic zone, which is found in oceanic trenches.
The pelagic zone can be further subdivided into two subregions: the neritic zone and the oceanic zone.
The neritic zone encompasses the water mass directly above the continental shelves whereas the oceanic zone includes all the completely open water.
In contrast, the littoral zone covers the region between low and high tide and represents the transitional area between marine and terrestrial conditions.
It is also known as the intertidal zone because it is the area where tide level affects the conditions of the region. If a zone undergoes dramatic changes in temperature with depth, it contains a thermocline.
The tropical thermocline is typically deeper than the thermocline at higher latitudes. Polar waters, which receive relatively little solar energy, are not stratified by temperature and generally lack a thermocline because surface water at polar latitudes are nearly as cold as water at greater depths.
Because this deep and cold layer contains the bulk of ocean water, the average temperature of the world ocean is 3.
If a zone undergoes a strong, vertical chemistry gradient with depth, it contains a chemocline. The halocline often coincides with the thermocline, and the combination produces a pronounced pycnocline.
The British naval vessel Challenger II surveyed the trench in and named the deepest part of the trench the " Challenger Deep ".
In , the Trieste successfully reached the bottom of the trench, manned by a crew of two men. Oceanic maritime currents have different origins.
Tidal currents are in phase with the tide , hence are quasiperiodic ; they may form various knots in certain places, [ clarification needed ] most notably around headlands.
Non-periodic currents have for origin the waves, wind and different densities. These currents can decompose in one quasi-permanent current which varies within the hourly scale and one movement of Stokes drift under the effect of rapid waves movement at the echelon of a couple of seconds.
This acceleration of the current takes place in the direction of waves and dominant wind. Accordingly, when the sea depth increases, the rotation of the earth changes the direction of currents in proportion with the increase of depth, while friction lowers their speed.
At a certain sea depth, the current changes direction and is seen inverted in the opposite direction with current speed becoming null: known as the Ekman spiral.
The influence of these currents is mainly experienced at the mixed layer of the ocean surface, often from to meters of maximum depth. These currents can considerably alter, change and are dependent on the various yearly seasons.
If the mixed layer is less thick 10 to 20 meters , the quasi-permanent current at the surface adopts an extreme oblique direction in relation to the direction of the wind, becoming virtually homogeneous, until the Thermocline.
In the deep however, maritime currents are caused by the temperature gradients and the salinity between water density masses.
In littoral zones , breaking waves are so intense and the depth measurement so low, that maritime currents reach often 1 to 2 knots. Ocean currents greatly affect Earth's climate by transferring heat from the tropics to the polar regions.
Transferring warm or cold air and precipitation to coastal regions, winds may carry them inland. Surface heat and freshwater fluxes create global density gradients that drive the thermohaline circulation part of large-scale ocean circulation.
It plays an important role in supplying heat to the polar regions, and thus in sea ice regulation. Changes in the thermohaline circulation are thought to have significant impacts on Earth's energy budget.
In so far as the thermohaline circulation governs the rate at which deep waters reach the surface, it may also significantly influence atmospheric carbon dioxide concentrations.
For a discussion of the possibilities of changes to the thermohaline circulation under global warming , see shutdown of thermohaline circulation.
The Antarctic Circumpolar Current encircles that continent, influencing the area's climate and connecting currents in several oceans.
One of the most dramatic forms of weather occurs over the oceans: tropical cyclones also called "typhoons" and "hurricanes" depending upon where the system forms.
The ocean has a significant effect on the biosphere. Oceanic evaporation , as a phase of the water cycle , is the source of most rainfall, and ocean temperatures determine climate and wind patterns that affect life on land.
Life within the ocean evolved 3 billion years prior to life on land. Both the depth and the distance from shore strongly influence the biodiversity of the plants and animals present in each region.
In addition, many land animals have adapted to living a major part of their life on the oceans. For instance, seabirds are a diverse group of birds that have adapted to a life mainly on the oceans.
They feed on marine animals and spend most of their lifetime on water, many only going on land for breeding.
Other birds that have adapted to oceans as their living space are penguins , seagulls and pelicans. Seven species of turtles, the sea turtles , also spend most of their time in the oceans.
A zone of rapid salinity increase with depth is called a halocline. The temperature of maximum density of seawater decreases as its salt content increases.
Freezing temperature of water decreases with salinity, and boiling temperature of water increases with salinity. If evaporation exceeds precipitation, as is the case in tropical regions, salinity will be higher.
Thus, oceanic waters in polar regions have lower salinity content than oceanic waters in temperate and tropical regions. Salinity can be calculated using the chlorinity, which is a measure of the total mass of halogen ions includes fluorine, chlorine, bromine, and iodine in seawater.
By international agreement, the following formula is used to determine salinity:. Nichols August 25, Outside Online.
Scientists say a new ocean will form in Africa as the continent continues to split into two Uwagbale Edward-Ekpu August 13, Quartz.
Pilgrim Trails Frances Lester Warner. The Huddlers William Campbell Gault. The continuous body of salt water that covers 72 percent of the Earth's surface.
The average salinity of ocean water is approximately three percent. The deepest known area of the ocean, at 11, m 36, ft is the Mariana Trench , located in the western Pacific Ocean.
Any of the principal divisions of this body of water, including the Atlantic, Pacific, Indian, and Arctic Oceans. Usage The word ocean refers to one of the Earth's four distinct, large areas of salt water, the Pacific, Atlantic, Indian, and Arctic Oceans.
The word can also mean the entire network of water that covers almost three quarters of our planet. It comes from the Greek Okeanos, a river believed to circle the globe.
The residence time of water in a reservoir, in turn, governs many of the properties of that reservoir.
For a full description of the water in the oceans, see seawater. For information on the forces that move water through the ocean, see ocean current.
For a description of the different kinds of waves that traverse the ocean, see wave. See also marine ecosystem for coverage of the life-forms that populate the marine environment.
Arbitrary boundaries separate these bodies of water. The boundaries of each ocean are largely defined by the continents that frame them.
In the Southern Hemisphere the southern portions of the Pacific, Atlantic, and Indian oceans and their tributary seas that surround Antarctica are often referred to as the Southern Ocean.
Many subdivisions can be made to distinguish the limits of seas and gulfs that have historical, political, and sometimes ecological significance.
However, water properties, ocean currents , and biological populations are not constrained by these boundaries.
Indeed, many researchers do not recognize them either. If area-volume analyses of the oceans are to be made, then boundaries must be established to separate individual regions.
In Erwin Kossina, a German geographer, published tables giving the distribution of oceanic water with depth for the oceans and adjacent seas.
This work was updated in by American geologist H. Menard and American oceanographer S. The latter only slightly changed the numbers derived by Kossina.
This was remarkable, since the original effort relied entirely on the sparse depth measurements accumulated by individual wire soundings, while the more recent work had the benefit of acoustic depth soundings collected since the s.
This type of analysis, called hypsometry , allows quantification of the surface area distribution of the oceans and their marginal seas with depth.
The Southern Hemisphere may be called the water hemisphere, while the Northern Hemisphere is the land hemisphere. This is especially true in the temperate latitudes.
This asymmetry of land and water distribution between the Northern and Southern hemispheres makes the two hemispheres behave very differently in response to the annual variation in solar radiation received by Earth.Wikimedia Commons Wikibooks Wikiquote. Encyclopedia of Verbindespiele. Changes in the thermohaline Mr Driving are thought to have significant impacts on Earth's energy budget. Words related to ocean tidepondpuddleseabluedrinkdeepbrinybrinesinkmainseawayhigh seassalt water. Polar waters, which Spiele Kostenlos Youda relatively little solar energy, are Topmodel Spiele De stratified by temperature and generally lack a thermocline because surface Kostenlos Casino Games Spiele Ohne Anmeldung at polar latitudes are nearly as cold as water at greater depths. The last zone includes the deep oceanic trenchand is known as the hadalpelagic. Bibcode : ApJ The word sea can also mean the vast ocean covering Ocean of the world. CH 50 Plastikmüll hat eine Lebensdauer von bis zu Jahren Poker Berlin Turnier gelangt letztlich als Mikroplastik kleinste Teilchen durch die Nahrungsaufnahme der Fische auch in Friendscuot24 Nahrungskette. Jade Capri. Termine 3 Dec. Wichtiger als alle Versuche, Plastik aus dem Wasser zu fischen, seien Abfallmanagement und Gesetze, um zu verhindern, das es überhaupt hineingelange, sagt sie heute.