Water is life, we have been hearing this since childhood and if seen, about 71 percent of our earth is covered by water and the remaining 29 percent is in the form of the land surface. But still, there is a shortage of drinking water on our earth because the oceans hold about 96.5 percent of all Earth's water, and it is known to all that the water of the oceans is salty. But have you ever thought about why the ocean's water is salty? The water of the oceans was not saline at all from the beginning, but over time this water became saline and there might be mainly two reasons responsible for this.
When it rains, the rainwater has to pass through rocks and many other natural places to get into the rivers, as rocks on land are the major source of salts dissolved in seawater. Due to this the salty substances present on the rocks at that time dissolve in this water and go into the rivers and the rivers later reach the seas. Due to this process going on for millions of years, these salts are getting accumulated in the oceans, causing the oceans' water to become salty.
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Generally, the ions from other substances of nature dissolve in the water of rivers and springs, but because their quantity is less, therefore the water of rivers and springs seems sweet to us. But when this water reaches the sea, the salts get deposited there. Among these, two main constituents of the salt are sodium and chloride, which make the salt, and their life period is very long, that is, when they reach the sea, they stay there for millions of years. And perhaps this is the reason why we find sea water salty.
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The second reason may be that there are many rocks and volcanoes present at the bottom of the ocean and salt is formed on the reaction of chloride and sodium present in them, making the sea water salty. You can estimate the amount of salt present in the ocean on the fact that if this salt is taken out of the ocean, and spread evenly over the Earth's land surface, it would form a layer more than 500 feet thick, about the height of a 40-story office building.
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