The water supply on Earth remains constant. Water continuously changes and relocates through the water cycle.
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Do you mean 'salty water'? The Earth contains a natural abundance of both sodium chloride (salt), and of water, and the salt is soluble in the water. The salt will form solid deposits when the water body concerned dries out, but otherwise it is kept in solution.
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Salt is not evaporated with water and remain as a residue.
Because salt water has higher density
There is the same amount of salt that goes out of the water to the salt that comes in the water so that is how it remains balance. Actually the oceans are slowly getting more and more salty, due to dissolved salts from the land in river water.
Salt water lowers the freezing point of water, making it harder for the water to freeze. This is because the salt disrupts the formation of ice crystals. As a result, salt water can stay frozen longer than plain water at the same temperature.
Yes, salt remain as a solid residue.
Evaporating the water will not remove any of the salt. Only the water molecules will evaporate. The salt will stay in the container.
Water is water. It will evaporate no matter what is it. The real question is whether or not the chemicals or salt will evaporate with the water or not. The answer to that is no. The salt/chemicals will stay in the container.
When salt is mixed with water sodium chloride is dissociated in ions.
No, it will be at the bottom - difference in density.