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The water in the oceans is coming from rivers. The river water is taking with it all kinds of material (some of it salt/minerals). As the ocean water is heated by the sun, the water becomes steam and moves in to the atmosphere (forming clouds, for example), but the salt does not vaporate as water does. Therefore the remaining water is salty (more salt for less water).

You can very easily try this by heating some water. First add a little bit of salt in a pot of water, stir it so it dissolves. Taste it before and after heating the water (caution: the water should cool before tasting). You'll get the idea.

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13y ago
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Q: What factors affect the salinity of the ocean?
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