Water moves in a never-ending cycle.
Even though water and its cycle are the basis of all life, fresh water represents less than 3% of the Earth's total water.
It is divided up between the permanent snows and polar ice-caps on the one hand, and the surface and underground reservoirs on the other.
The remaining 97% of the Earth's water in the oceans and seas can only be made drinkable by using sophisticated and costly techniques. 

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