The Ocean

We have been studying Swimming creatures in science. One of the things we have learned is this. The earth is not billions of years old, because if it was the oceans would be much saltier.
The oceans are actually getting saltier. This is because salt is constantly entering the ocean, from rivers and volcanos, but it can not leave the ocean very easily. If the ocean was billions of years old, it would be a lot saltier.

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