Why is the ocean salty?

You ask: Why ocean salty?

Rain fall on rock. Rain not pure water — it little bit sour, like berry gone bad. Sour water eat rock slow, break loose tiny bits of salt and stone-dust. River grab these bits, carry them down, down, all the way to sea. Then sun cook top of ocean, lift water up to make cloud — but salt too heavy, salt stay behind. Water leave, salt no leave. Do this a million million years, salt pile up in big water. So much salt hide there now that if Caveman scrape it all out and spread it flat on dry land, it stack near five hundred foot deep — tall as forty huts piled up. Also cracks in sea floor breathe hot mineral straight into ocean. So sea get saltier and saltier, slow, like Caveman fill cave one rock at a time. Cave wisdom: river always give ocean salt, but sun never take salt back.