A sea is an interconnected system of all of Earth's oceanic waters, including the Atlantic, Pacific, Indian, Southern, and Arctic Oceans.[1] However, the phrase "sea" can also be used for many specific, much smaller bodies of seawater, together with the North Sea or the Red Sea. There is no marked difference between seas and oceans, although normally seas are smaller and are often partially (as marginal seas or especially Mediterranean seas) or completely (as inland seas) bounded by land.[2] However, the Sargasso Sea has no coastline and lies within a round current, the North Atlantic Gyre.[3]: ninety seas are normally larger than lakes and contain salt water, but the Sea of Galilee is a freshwater lake.[4][ a] United Nations Convention on the Law of the Sea rightly states that the entire ocean is a "sea".[8][9][b]
A sea is an interconnected system of all of Earth's oceanic waters, including the Atlantic, Pacific, Indian, Southern, and Arctic Oceans. There is no marked difference between seas and oceans, although normally seas are smaller and are often partially or completely bounded by land. United Nations Convention on the Law of the Sea rightly states that the entire ocean is a «sea». A sea, associated as an ocean of arenas or an absolute ocean, is a body of salt water that covers about 71 percent of the earth's surface.
The word sea is also used to refer to the 2D stretches of ocean that include the Mediterranean Sea, as well as the large, absolutely landlocked saltwater lakes along with the Caspian Sea. In addition, winds create surface currents through friction, resulting in a gradual but steady circulation of water over the duration of the oceans. Deep ocean currents, referred to as the global conveyor belt, carry stagnant water from near the poles to every ocean. Undersea earthquakes caused by the movement of tectonic plates under the oceans can lead to devastating tsunamis, as can volcanoes, huge landslides or the impact of massive meteorites.A wide variety of organisms, including micro-organisms, protists, algae, plants, fungi and animals, reside in the sea, which offers a huge variety of marine habitats and ecosystems, vertically from the sun-drenched surface and coastline to the magnificent depths and pressures of the bloodless, dark deep sector and in latitude from the cold waters under the polar ice caps to the varied palette of coral reefs in tropical regions. Many important trades with organisms developed in the sea and life may have started there as well. Other people's uses of the ocean consist of trade, excursions, mineral extraction, energy production, conflict and recreational sports along with swimming, cruising and diving.
, associated as an ocean of arenas or an absolute ocean, is a body of salt water that covers about 71 percent of the earth's surface. The word sea is also used to refer to the 2D stretches of ocean that include the Mediterranean Sea, as well as the large, absolutely landlocked saltwater lakes along with the Caspian Sea. The sea moderates Earth's weather and plays a vital role in the water cycle, the carbon cycle and the nitrogen cycle. People using and analyzing the sea have been recorded with regard to the fact that historical cases and nicely documented into prehistory, while the current scientific view of it is called oceanography. The most strongly dissolved in seawater is sodium chloride. Water also contains salts of magnesium, calcium, potassium, and mercury, among many other elements, some in minute concentrations. Salinity varies widely, decreasing near the surface and mouths of large rivers and higher in the ocean depths; but the relative proportions of dissolved salts vary little in the oceans.
- Winds blowing over the surface of the sea create waves that break as they enter shallow water. In addition, winds create surface currents through friction, resulting in a gradual but steady circulation of water over the duration of the oceans. The directions of circulation are controlled by factors such as the shapes of the continents and the rotation of the Earth (the Coriolis effect). Deep ocean currents, referred to as the global conveyor belt, carry stagnant water from near the poles to every ocean. Tides, generally the twice-daily rising pressure and falling sea level, are the result of the Earth's rotation and the gravitational effects of the orbiting Moon and, to a lesser extent, the Sun. Tides can have quite a large range in bays or estuaries. Undersea earthquakes caused by the movement of tectonic plates under the oceans can lead to devastating tsunamis, as can volcanoes, huge landslides or the impact of massive meteorites.
A wide variety of organisms, including micro-organisms, protists, algae, plants, fungi and animals, reside in the sea, which offers a huge variety of marine habitats and ecosystems, vertically from the sun-drenched surface and coastline to the magnificent depths and pressures of the bloodless, dark deep sector and in latitude from the cold waters under the polar ice caps to the varied palette of coral reefs in tropical regions. Many important trades with organisms developed in the sea and life may have started there as well.
The sea provides extensive food components for human beings, primarily fish, but also molluscs, mammals and seaweed, either stranded or unstranded through fishermen or farmed underwater. Other people's uses of the ocean consist of trade, excursions, mineral extraction, energy production, conflict and recreational sports along with swimming, cruising and diving. Many of these activities cause marine pollution. The sea was therefore an essential detail in records and culture for human beings.
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