The amount of salt in the oceans actually provides an argument for the fact that the earth is not nearly as old as what some scientists would like you to believe. You see, we have studied the hydrologic cycle enough to know how much salt gets put into the ocean every year. In addition, we have a pretty good idea of how much salt is removed from the ocean every year. In the end, then, we can actually “add up” the amount of salt going into the ocean and “add up” how much is being removed. As you might expect, this inventory leads us to the conclusion that more salt is going into the oceans than what is being removed. In the end, then, the oceans are getting saltier and saltier. Suppose we assume that the oceans originally had absolutely no salt in them, and that all of the salt in them today came from the hydrologic cycle. Well, based on the inventory that scientists have done, you can actually determine how long it would take for freshwater oceans to become as salty as they are now. It turns out that the data indicate it would take, at the very most, 62 million years to go from freshwater oceans to oceans with the salinity we see today.
What does this tell us about the age of the earth? Well, first of all, it makes it awfully hard to believe that the earth is billions of years old as some scientists want you to believe. After all, if it really were billions of years old, then why aren't the oceans a lot saltier than they are now? No one who believes that the earth is billions of years old has any convincing answer to this question. Secondly, the times that one calculates this way are, in fact, only upper limits to the real age of the earth. God certainly created the oceans with salt in them, since the organisms in the ocean are designed to live with salt. Thus, the assumption that the oceans were, at one time, completely freshwater is pretty silly. Any salt that the ocean initially had would lower the time it would take to reach the salinity we see now. Also, careful analysis of the hydrologic cycle tells us that the rate of salt being dumped into the ocean most likely decreases as time goes on. As a result, the rate of salinity increase we measure now is probably lower than what it was a few thousand years ago. Finally, the worldwide Flood most likely added a lot. Thus, the salinity of the oceans really tells us that the earth is significantly younger than a few million years old.
That is off of "Exploring Creation with Physical Science 2nd Edition Version 8.0" I don't own this, so please don't sue me. :]]
