| Fresh Water |
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Fresh water is Water that contains only minimal quantities of dissolved Salt s, especially Sodium Chloride , thus distinguishing it from Sea Water or Brackish Water . All fresh water ultimately comes from precipitation of Atmospheric Water Vapor , reaching inland Lake s, River s, and Groundwater bodies directly, or after Melting of Snow or Ice (see Hydrologic Cycle ). Access to fresh water is a critical issue for the survival of many species, including Human s, especially in Desert or otherwise arid areas. See Water Resources . Even on a Ship or Island in the ocean, there can be a "water shortage", which means a shortage of fresh water. Seawater is undrinkable directly. Fish can only tolerate a range of sodium chloride concentrations in water. Most species cannot live in both fresh and salt water, though some species move between the two, in Brackish water. Saltwater fish have access to an abundance of salt, and try to get as much salt out of their body as possible, while trying to keep the water. Freshwater fish do the opposite: they have too much water, and too little salt. See also in the water of a Fish Pond ]]
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