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Why is the sea salty?

Why is the sea salty?
Jack Daved Capman from Swansea (Age 5-14)

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One Response

  1. When rivers are running down to the sea they carry silt, sand and organic materials. They also dissolve minerals(eg Sodium salts, Potassium salts etc from the rocks in the river. In the river, the concentration of these salts is very low that is why we can take our drinking water from these sources.

    In the sea the sand and silt sink to the sea bottom. At the sea surface the wind and sun help to evaporate large amounts of water(pure H2O) from the sea surface. Which then becomes rain and joins the fresh water in the rivers. So over time, the salt concentration in the sea increases. After millions of years of erosion and evaporation, the salt concentration in the sea increases. Inland seas in lower latitudes(near the equator) have the highest concentrations of salt because they have low levels of river flow into them and high evaporation rates out of them because it is hot.

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