Question

why is sea water saline​

Answer 1

Answer:
Ocean salt primarily comes from rocks on land
Salt in the ocean comes from rocks on land. The rain that falls on the land contains some dissolved carbon dioxide from the surrounding air. This causes the rainwater to be slightly acidic due to carbonic acid (which forms from carbon dioxide and water).

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Answer 2

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The rivers in the course of their flow and falling into the sea bring with them deposits of salt and this process has been going on for lakhs of years, it makes sea-water saline.