Where did all that salt in the oceans come from? Why isn't salt in all the water on Earth?

Why isn't salt in all the water on Earth?
There is salt in all the water. There is not very much of it. Fresh water comes from the sky as rain -- water picks up some salt from the rocks it flows over on its way to the ocean (or salt lake).
Then it evaporates from the ocean leaving its salt behind. Over the years that makes the oceans salty...

pretty well all water DOES have salt in it. just very small concentrations (look at the salt content of your bottled water for example). Really, what you are asking is why most "fresh" water, water found on land, only has a few hundred parts per million (ppm) of dissolved salts (give or take depending on the water) yet the ocean, which is simply the accumulation of all such water over time, has 35,000 ppm of dissolved salts. And the main reason is that water evaporates but the salts do not. The really interesting question is why the oceans only have about 35,000 ppm dissolved salts rather than more, and why that is the concentration that prevails through time? But that is a separate answer; you didn't ask the question.

As others say, the minute amounts of salt in all bodies of waters becomes concentrated in the oceans as water evaporates, leaving he salt behind.
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<O.K..rain water flows over rocks and picks up salt on it's way to the ocean...why doesn't rain water pick up salt on it's way to the Great Lakes? There are as old as the oceans, yet they remain fresh water. How so?> First, please don't add additional information about your question in an Answer field. I don't know why Yahoo allows askers access to their own Answer fields because it is nothing but confusing, but they do. Use the Update function instead to expand on a question (or, in this case, simply ask a separate Question).
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The answer to your question is that the Great Lakes aren't oceans--they aren't the end of the hydrologic chain. There are outlets that drain the Great Lakes into the oceans--the St. Laurence Seaway drains into the Atlantic Ocean, washing all the salt downstream and preventing it from concentrating in the Lakes. In lakes that don't have outlets, such as the Red Sea or the Great Salt Lake, the salts do continue to concentrate, in some cases to greater concentrations than in the oceans.
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O.K..rain water flows over rocks and picks up salt on it's way to the ocean...why doesn't rain water pick up salt on it's way to the Great Lakes? There are as old as the oceans, yet they remain fresh water. How so?