An Explanation Exemplar
Why the sea is salty
Seventy percent of the world’s surface is colored with water. Most of the world's water is salty how did it become salty?
The salt in the oceans has come from the soil and rocks on the land. Rain falling on the land flows through the the soil and soaks through the rocks. As it does dissolves traces of chemicals called minerals is common salt.
Much of the water, now containing traces of salt eventual makes its way back to the oceans either along rivers or rocks.
Water is being constantly evaporated from the oceans, forming clouds that result in rain. However, when water is evaporated the salt is left behind.
In this way, over millions of years, salt has built up in the ocean, making the sea water gradually more salty.
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