Speaking of the seas, it is necessary to cover the entire hydrosphere as a whole, because the water - it is something without which life on Earth is not only impossible, it would not even be born on our planet.
Where did the water?
Scientists still have not come to a definite opinion as to where in the world there was water.But the most popular and is now considered a realistic hypothesis, according to which the Earth once fell asteroid composed entirely of ice.This version looks quite science, as in the past our planet was repeatedly subjected to impact of meteorites and asteroids.It is likely that some of them contain water as ice or snegopodobnogo substance.
Another group of scientists believes that the Earth was at first very similar to a cold meteorite.In the process of melting ice due to increased solar activity and the Earth's axis tilt began to appear the seas and oceans.And as the sun heats the planet unevenly, then it started water cycle.
But there are also those who believe that the Earth, on the contrary, was at first like a red-hot ball.Then, when the surface of the planet began to cool, water is separated from the mantle beneath the sweat.But all these theories still does not answer the question, how many seas in the world.
Our planet is unique.It has the largest mass of all kind, moreover, the only known human planets that is life.It was formed more than 5 billion years ago, drawing to itself the moon, became the first and only companion.Seas and oceans of the Earth depends on the lunar cycle.This dependence is visible on an example of the tides.
Asked how many seas in the world, in the textbooks written a number from 76 to 83. There are also some evidence that there are only 49 or 100. If you think about it a lot.However, compared to the total amount of water in the world, even with the amount of land - and 76, 83 and the sea - negligible.The scatter in the figures obtained because of all the different interpretations of this notion.Someone thinks seas only part of the coastal ocean.But then, what to do with inland seas?And with all inter-island generally becomes clear.In addition, many of the sea now called bays.Since the pond is not called for hydro-geographic differentiation, and tradition.For example, everyone knows about the Caspian Sea, although the sea is a huge lake with salt water is not bitter.
What kinds divided the sea?
- interisland .They are often referred to the total number of seas, because they are located between the islands and not coastal Ocean.These include Sea Fiji, Javanese, of New Guinea.
- inland sea .As the name implies, they go deep into the land and the ocean are connected straits.In this regard, a unique Azov Sea near the Crimean peninsula.On the ocean, it is connected not just straits, but also other seas - the Black and the Mediterranean, which also belong to the category of inland seas.Mediterranean Sea is connected to the Atlantic Ocean through the Strait, Black and Azov - through the Kerch Strait.
- semi-.It is the sea, separated from the mainland by the ocean.These include: Yellow, Arabian, Aegean, East China, Coral, Andaman, Sea of Okhotsk, the Caribbean, Japan, Adriatic Sea, South China Sea and Baffin Bay.
- Marginal .They are well-communicated with the ocean, since they are just in the coastal area of the mainland.These include the Ross Sea, Weddell Sea, Laptev Sea, Arafura, Bellingshausen Timor, Chud, Norwegian, North Sea, Chukchi, Labrador, Greenland, Kara, East Siberian.
How many seas in the world who call open?Not so much.These include the Sargasso, Ionian, Tyrrhenian.
Are all taken into account?
This classification is, of course, helps to organize the water spaces, but complicates the answer to the question, how many seas on Earth.Scientists do not always agree with this division.As a result, outside of the attention of researchers are the marginal, the open sea, which, in fact, have no shores.The most famous is the Sargasso Sea, which is composed entirely of algae.
Garbage Sea
At the moment, due to the general deterioration of the ecology of the planet, the question: "How many seas in the world?"It requires drastic revision.For example, scholars have identified three, however, they are not made of water, and out of the garbage.For example, in the Indian and Pacific Ocean migrate entire continents floating plastic and polyethylene.Decomposing under the action of the sun and the water, all the trash floating in the water highlights the world's oceans of plastic products of chemical reactions.
they disappear!
But another problem - the disappearance of water resources.For example, the once huge Aral lake has almost disappeared due to human activities.Due to the large intake from rivers donor to the Aral lake has ceased to flow fresh water.As a result, almost completely disappeared fauna that inhabit this sea-lake.
All this shows that the answer to the question, how many seas in the world, has yet to give.
