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Why is the sea so salty?

In summer, when I went to the seaside to play, I accidentally choked two mouthfuls of sea water. Then I knew that the sea water was not so salty. It was much saltier than salt. Why is the sea so salty?

If you have a chance to go to the seaside, you will find that the sea water is salty and bitter. What is the reason for this?

It turns out that there are many salts dissolved in the sea water, of which the largest amount is sodium chloride, which is the common salt we usually eat, accounting for 78% of the total salt in the sea water. If we extract all the salt from the sea and spread it on the land, the land will increase by 150 meters. There are also a lot of magnesium chloride and magnesium sulfate in the sea water, which account for about 15% of the salt. Their taste is very bitter, which is the main component of bittern used in making tofu. This kind of food is not only bitter, but also diarrhea.

If there are these things in the sea water, how can they not be salty and bitter?