If the fresh water flows out to the sea, then how come the sea water is salty?

All the rivers that carry fresh water empty themselves into the sea (or) ocean, but the oceans contain only salt water. This is due to several influences that occur naturally. The first formation of seas must have less salt concentration but as the time passed the rains broke the rocks and transferred all the rocky minerals to sea, making it more saltier.

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http://wonderwhizkids.com/index.php/salty-oceans