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Why is ocean water salty?
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On average, one liter of seawater contains 34.7 g of salt, the equivalent of 6 teaspoons. The presence of salt in the ocean didn't happen overnight. To understand this phenomenon, we must go back 4.6 billion years. Back then, the earth was covered with volcanoes that spewed out water vapor, chlorine, and sulphur. 100 million years later, the earth began to cool and the water vapor condensed. Chlorine and sulfur dissolved in the water, making it salty. Today, the flow of surface water continues to bring these minerals to the seas and oceans.
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