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Sea water is salty because the water is evaporated and mixes with the air and becomes salty itself because of the presence of chemical in the air. When this water again comes back through rain and gets mixes with sea water again makes it salty.
The sea water is salty because the water is evaporated from the sea and made as the clouds in the process of water cycle when they are flowing from the mountains the water will wash the rocks and the soil present on the ground because of this the washed out rock will mix in water and the small partials of rock will taste as salty and called salt when the water is evaporated then the salt is left out.