There are rocks at the bottom of the ocean, whose salt also dissolves in sea water. Similarly, there are volcanoes below the oceans, which also break from time to time releasing gases such as lava and chlorine, sulfur dioxide etc. There are also sodium substances in the sea. With these the reaction of chlorine etc. becomes salts. The salt of the food is the compound of sodium and chlorine (NaCl). So in this way the salt continues to grow in the sea.
The salt that exists in the sea water remains in it, but the water of the ocean by the heat of the ocean becomes vaporized and comes out of the ocean, and becomes dense in the sky and becomes cloudy. This vapor is pure water, i.e. there is no salt in it. In this way the water of the sea continues to be re-cycled, but only the salt deposits in the sea.
Why does the salinity of the sea increase?
Sea water has an average of 3.5 percent salt. This means that every 100 grams of sea water will give you 3.5 grams of salts. This salts are mainly chlorine salts, such as eater salt (NaCl). This concentration of salts is not uniform everywhere in the ocean. For example, the salinity of sea water near the river faces decreases because there is heavy inflow of sweet water due to the rivers there.
About Dead sea
Similarly, salinity in some small oceans can be much more. For example, in the Dead Sea, whose salinity is ten times more than the normal sea, i.e. about 33.7 percent. The reason for this is that it is isolated from other seas, so that they can not exchange water. The second reason is that vaporization is very high in this ocean. Therefore, the concentration of salts is also very fast.
Due to so much saltwater the buoyancy of the Dead Sea is unusually high, so that the man can not drown in this ocean, it will float in the water like a wood.
Due to this high salinity, micro-organisms do not grow in the Dead Sea, and hence there are fewer fish and other living organisms that survive by eating micro-organisms. Perhaps for this reason this ocean is called the Dead Sea. But the ocean is very popular in the tourists, probably because they can rest from the fear of drowning and play water sports. People also believe that water in this ocean has the ability to cure many diseases.
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