Cold water is denser than warm water, which makes it sink to the bottom, where a fairly steady temperature is maintained. The same process happens as floating surface ice melts into very cold water in the spring. During these periods, nutrients are churned from the floor and brought to the surface.
Freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids with less than 1000 parts per million (ppm) of dissolved salts.
Every living thing on Earth needs water to survive, but over one hundred thousand species, including our own, need a special kind of water that can only be found in certain places and is in very rare supply: freshwater.
Freshwater is a renewable and variable, but finite natural source. It is vital for life, supporting ecosystems and human civilizations. Freshwater can only be replenished through the process of the water cycle.
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