Why does the salt level not change in the oceans?

Answer 1

The salt level does not change in the ocean because over a billion years ago the Ice Age Period was here on earth and all oceans where solid Ice and when Global Warming set in motion all the Ice melted and the bottom of the ocean floor is salt so when it melted the salt came above the water and the glaciers mixed with that and glaciers are mostly made out of Ice (mostly 321 feet tall) so it never changes.