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The sea is generally a large salt water area that connects to the oceans, or large saltwater lakes that do not have natural ocean access like the Caspian Sea and the Dead Sea. The term is sometimes used with some freshwater lakes closed or with natural passage to the sea, such as the Sea of Galilee in Israel, a small freshwater lake with no natural passage to the ocean or the Lake at Cambodia. This term is used in ordinary life as a synonym for the ocean, as in tropical seas or coastal expeditions, or seascapes are only significant to the waters of the great positive in general.
The richest ions in seawater are chlorine and sodium. Sea water also contains magnesium, sulfate, calcium, potassium, and many other components, some of which are very small. The salinity of sea water varies greatly. The low salinity of the water is near the surface and the major river mouths, and higher in the depths of the ocean, however, the relative proportions of dissolved salts vary little across the oceans. Carbon dioxide from the air is currently being absorbed by the sea in increasing quantities, reducing the pH of seawater in a process known as ocean acidification, which can potentially damage ecosystems. sea in the near future.
Winds blowing on the surface of the sea create waves, which break when they reach the shallow zone. Winds also produce surface currents due to friction, slow travel speeds but across oceans. Flow direction is governed by factors including the shape of the continents and the rotation of the Earth (deep sea coriolis forces), called thermal salt streams, carrying cold water from near to the poles. all the oceans. The tides are usually raised and lowered twice a day, caused by the rotation of the Earth and the gravitational effects of the Moon spinning around, and less influence from the Sun. Tides may be high in bays or estuaries. Tsunamis can be caused by sea earthquakes arising from the movement of moving tectonic plates, volcanic eruptions, large landslides, or large impact from meteorites.
Marine life is diverse, including viruses, bacteria, protozoa, algae, plants, fungi and marine animals, which provide a variety of habitats and marine ecosystems that change from the surface. Sun-drenched sea to great depths with great pressure of dark and deep seabed. The sea also changes in latitude from the cold waters beneath the Arctic ice to the colorful variety of tropical reefs. Many large groups of organisms have evolved from the sea and the origin of life may have started there.
The sea provides significant foodstuffs, mainly fish, crustaceans, mammals and seaweed through capture in the wild or artificial rearing. The over-exploitation of these food resources has become a major issue.
The sea also serves other purposes, including trade, tourism, underwater mining, electricity, warfare, and recreational activities like swimming, surfing, sailing and scuba diving. Sea is also at risk of pollution. The sea has played a significant part in culture throughout its history, with a significant presence in literature, most notably from Homer's Odyssey, in art, in cinema, on stage, and in classical music. On the symbol, the sea appears as monsters as Scylla in mythology and represents the unconscious in the dreamer.