Fact of the Day
Salt Water
Carbonate sedimentary rocks, obviously laid down in an aquatic environment, have been dated to 1 billion years ago. They are the source of the salt in the ocean's waters. When the oceans formed, the high carbon dioxide content of the atmosphere at that time would have allowed a buildup of dissolved carbon dioxide in the water and made these early oceans acidic and capable of dissolving surface rocks that would add to the water's salt content.
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