Water resources of the earth are valuable and unique sources of life therefore knowledge and understanding of importance of these benefits of the nature is very important. On the earth there is a set of the seas, their exact quantity was counted not so long ago.
It is considered that on the earth there are 81 seas today. All seas are divided by the arrangement in the following directions: The Atlantic, Pacific, inland seas and the seas adjoining on the Southern ocean North ledovitym the ocean and the Indian Ocean.
Views of the seas
Traditionally the seas can be subdivided into four groups: - interisland, - half-closed, - suburban, - internal. Inland seas are "in" continents, but can have connection with the ocean or other adjacent sea. Such seas are subject to a great influence of sushi, water in them can have changeable level. Such seas treat: Dead Sea, Aral Sea and Caspian Sea. Some scientists and researchers consider a coastal part of the ocean the sea and therefore inland seas, the interisland seas they do not carry to the general list. The suburban seas are located on the edge of sushi and have a direct exit to the ocean, and here the half-closed seas are protected from the ocean with the continent, but partially. The interisland seas, proceeding from a basis of the name, are located between various islands. It is possible to rank the following as the interisland seas: Fiji, Java and New Guinean Sea.
Lack of the seas
In comparison with areas of land and the earth in general the area of the seas on the planet is small. There are even garbage seas which because of a large number of waste turn into the floating garbage can polluting the World Ocean. Such seas from plastic and other waste were observed in waters of the Indian and Pacific Ocean. It is worth mentioning also the disappearing seas. For example, the huge Aral Sea because of influence of economic activity of the person began to disappear, water as though evaporates. And all this happened because of a water intake from other rivers therefore fresh water ceased to come to the Aral Sea. As a result all fauna living in this once enormous sea just disappeared, the climate of the area changed: where earlier gardens blossomed and the breeze, today only desert barkhans and skeletons of the ships which decayed from time blew. This terrible tragedy of the region which did not remain unnoticed in the world. Attempts the sea artificially were made to revive, but they were vain. Later more half a century it became obvious that only natural powers are capable to return initial balance of water and sushi, today the sea slowly comes to life. The question of an ecological situation and a question of safety of water resources becomes more sharply every year: scientists assume that climate change and active expansion of the person to the elements will erase from a face of the planet not one more sea, and not far off war between the people not for territories, and for fresh and salty water.