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Fresh water (also freshwater or fresh-water) is water that contains only minimal quantities of dissolved salts, especially sodium chloride, thus distinguishing it from sea water or brackish water. All freshwater ultimately comes from precipitation of atmospheric water vapor, reaching inland lakes, rivers, 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, especially in desertEgyptian desert In geography, a desert is a landscape form or region that receives little precipitation. As a consequence, deserts have a reputation for supporting very little life. Compared to wetter regions this may be true, although upon closer examina areas. See water resourcesWater resources are sources of water that are useful to human beings for drinking, recreation, irrigation, livestock production, industry, etc. Even though 70% of the Earth's surface is covered with water, a majority of it is salt water. Only 3% of water.
Even on a shipA ship like a boat, is a vehicle designed for passage or transportation by water. A ship usually has sufficient size to carry its own boats, such as lifeboats, dinghies, or runabouts. A rule of thumb saying (though it doesn't always apply) goes: "a boat c or islandAdriatic sea An island is any piece of land smaller than a continent and larger than a rock, that is completely surrounded by water. Very small islands are called islets . Although seldom adhered to, it is also proper to call an emergent land feature on a, there can be a "water shortage", which means a shortage of fresh water.
For fishAtlantic herring, Clupea harengus one of the most abundant species in the world Photo A fish is a poikilothermic (cold-blooded) water-dwelling vertebrate with gills. There are over 27,000 species of fish, making them the most diverse group of vertebrates., it strongly matters how much dissolved sodium chloride the water they live in has. Most species cannot live in both fresh and salt water, though some species move between the two. Salt water 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. Fresh water fish do the opposite: They have too much water, and too little salt.
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