the sea facts

[39] This rushes in a sheet up the beach before retreating into the sea under the influence of gravity.

Destructive fishing practices are killing hundreds of thousands of marine species each year and helping to destroy important undersea habitats. The age of the trans-Atlantic liners waned as cheap intercontinental flights became available. With the rapid growth of industrialization after the 1960s, several dams have been created. Eighty percent of all pollution in seas and oceans comes from land-based activities. In the southeast, the Adriatic Sea connects to the Ionian Sea at the 72-kilometre (45 mi) wide Strait of Otranto.. [1] It moderates Earth's climate and has important roles in the water cycle, carbon cycle, and nitrogen cycle. The major causes of coral reef decline are coastal development, sedimentation, destructive fishing practices, pollution, tourism and global warming. Ninety percent of the world’s fishermen and women operate at the small-scale local level, accounting for over half the global fish catch. Although tides are regular and predictable, the height of high tides can be lowered by offshore winds and raised by onshore winds. This movement is slow and is driven by differences in density of the water caused by variations in salinity and temperature. A colder heat sink enables more efficient power generation, which is important for expensive nuclear power plants in particular. Corals often contain photosynthetic symbionts and live in shallow waters where light penetrates. The hydrogen sulfide-rich waters of the Black Sea pose a potential danger for the surrounding land regions. [51], Besides gyres, there are temporary surface currents that occur under specific conditions. It is the most indented section of the Mediterranean Sea on the continent of Europe.. Oysters can be reared on trays or in mesh tubes. When waves meet others coming from different directions, interference between the two can produce broken, irregular seas. [5][a] The United Nations Convention on the Law of the Sea states that all of the ocean is "sea". The Adriatic Sea is part of the Mediterranean Sea separating the Italian Peninsula from the Balkan peninsula..
The ratio of by-catch from shrimp fishing ranges from 5:1 in temperate zones to 10:1 and more in the tropics. [217], Much floating plastic rubbish does not biodegrade, instead disintegrating over time and eventually breaking down to the molecular level. [207] Drilling for oil in the sea has environmental impacts. The potential energy of the displaced seawater is turned into kinetic energy, creating a shallow wave, a tsunami, radiating outwards at a velocity proportional to the square root of the depth of the water and which therefore travels much faster in the open ocean than on a continental shelf. But later after colonizing and developing the coasts, the Greeks renamed it to the ‘hospitable sea’. Some endorheic lakes are less salty, but all are sensitive to variations in the quality of the inflowing water. [3] However, the Sargasso Sea has no coastline and lies within a circular current, the North Atlantic Gyre. People love coming to beautiful mountains and coasts.
In the era of sailing ships such calm was really deadly. This theory seems plausible when you take into consideration the other colored seas, the Red Sea, and the White Sea. Eventually, a regular pattern of high and low waves (or swell) is developed that remains constant as it travels out across the ocean.". [218] In the centre of the Pacific gyre there is a permanent floating accumulation of mostly plastic waste[219] and there is a similar garbage patch in the Atlantic. [169][169] Freight forwarding firms book cargo, arrange pickup and delivery, and manage documentation. The cold water moves back towards the equator as a deep sea current, driven by changes in the temperature and density of the water, before eventually welling up again towards the surface. In the era of sailing ships such calm was really deadly. The sea, the world ocean, or simply the ocean is the connected body of salty water that covers over 70% of Earth's surface (361,132,000 square kilometres [139,434,000 sq mi]), with a total volume of roughly 1,332,000,000 cubic kilometres [320,000,000 cu mi]. The waves reach their maximum height when the rate at which they are travelling nearly matches the speed of the wind. [67], Material worn from the margins of the land eventually ends up in the sea. Common Dolphins and Bottlenose Dolphins are not an uncommon sight either. The surface currents flow in a clockwise direction in the Northern Hemisphere and anticlockwise in the Southern Hemisphere. Other useful equipment includes fins and snorkels, and scuba equipment allows underwater breathing and hence a longer time can be spent beneath the surface. It takes a thousand years for this circulation pattern to be completed. [229], Several nomadic indigenous groups in Maritime Southeast Asia live in boats and derive nearly all they need from the sea. [172] In 2011, the total world production of fish, including aquaculture, was estimated to be 154 million tonnes, of which most was for human consumption. google_ad_slot = "9761313702";

Shrimp farming, too, is highly destructive.

You can see a detailed list of the available fishes on this Wikipedia page. As the Moon rotates around the Earth, so do these ocean bulges move around the Earth.

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