Fresh water is water with less than 0.5 parts per thousand dissolved salts. Fresh water may be found in lakes, rivers, and bodies of groundwater. The ultimate source of fresh water is rain (or, to be more precise, the precipitation of atmospheric water vapor, see also hydrologic cycle).
| Water salinity based on dissolved salts in parts per thousand (‰) | |||
|---|---|---|---|
| Fresh water | Brackish water | Saline water | Brine |
| < 0.5 ‰ | 0.5 - 30 ‰ | 30 - 50 ‰ | > 50 ‰ |
Access to unpolluted fresh water is a critical issue for the survival of many species, including humans, who must drink fresh water in order to survive. Only 3% of water on the Earth is fresh water, and over two thirds of this is frozen in glaciers and polar ice caps (see water resources).
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