History of the Ocean
Distribution of Water Across the Planet:
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How did the ocean come to exist? Well, it was caused by outgassing from the Earth’s mantle through volcanic eruptions thrust steam into the atmosphere. Large volumes of rain eventually formed oceans and all of the hydrosphere Prehistoric oceans o Volcanic gases contributed sulfur and carbon dioxide; oceans were highly acidic o Carbon dioxide got trapped in limestone rocks that were forming o Calcium carbonate reduced the acidity of early oceans |