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The short answer is it's the salt. But I think what you're really asking is how did it get so salty. As fresh water flows through the continents, it picks up salt from the minerals. Then that is dumped into the ocean basin when the water gets to the sea. The water evaporates and returns as rain water, but the minerals stay behind. So after a long time, you get an accumulation of salt in the ocean.

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11y ago

What else can I help you with?