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Geography For Kids , The Study of Our Earth
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The Ocean’s Salinity

Ocean Salinity

As discussed earlier in this chapter, one of the important characteristics of water is that it is a superb solvent. This means that other substances, such as minerals, can dissolve quickly and easily into it.





The ocean contains a soup of the many different minerals found across the surface of the Earth, all dissolved into the water. These minerals make up about 3.5% of the total volume of the Earth’s oceans.

By far, the most common mineral found dissolved in sea water is salt. Have you ever tasted ocean water? What does it taste like? Because salt is the most common mineral in the waters of the oceans, it is no surprise that the ocean tastes salty.

The amount of salt dissolved in the waters of the Earth’s oceans, or the salinity of the oceans, can vary greatly from location to location. This salinity is dependent on two important factors. Firstly, the amount of evaporation taking place; and secondly, the amount of fresh water being added.

As water evaporates, it leaves the salts and other minerals behind. This causes the water left behind to be more salty. As fresh water is added, either via rivers or via rainfall, the salinity of the ocean in a particular location is decreased.

 

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