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In the beginning, the primeval seas were probably only slightly salty. But over time, as rain fell to the Earth and ran over the land, breaking up rocks and transporting their minerals to the ocean, the ocean has become saltier. Rain replenishes freshwater in rivers and streams, so they don't taste salty.
Keeping this in consideration, which is the saltiest ocean?
As a result, in the future the Dead Sea may resemble the world's truly saltiest body of water – which is a pond. The waters of Don Juan Pond in Antarctica are 44% saline.
Correspondingly, why is the ocean becoming more salty?
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).
Absent a few key processes, the ocean's salinity would continuously increase; however, there are several mechanisms, called “salt sinks,” that help remove salts from the oceans at pretty much exactly the same rate as they are added. Once the seawater evaporates, the salt concentration increases.