Fresh water

Fresh water is naturally occurring water on Earth's surface in ice sheets, ice caps, glaciers, icebergs, bogs, ponds, lakes, rivers and streams, and underground as groundwater in aquifers and underground streams. Fresh water is generally characterized by having low concentrations of dissolved salts and other total dissolved solids. The term specifically excludes seawater and brackish water although it does include mineral-rich waters such as chalybeate springs. The term "sweet water" (from Spanish "agua dulce") has been used to describe fresh water in contrast to salt water. The term fresh water does not have the same meaning as potable water. Much surface fresh water and some ground water are unsuitable for drinking without some form of purification because of the presence of chemical or biological contaminants.

Contents

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• 1Systems
• 2Sources
• 3Water distribution
• 4Numerical definition
• 5Aquatic organisms
• 6Fresh water as a resource
  • 6.1Agriculture
  • 6.2Limited resource
  • 6.3Fresh water withdrawal
  • 6.4Causes of limited fresh water
  • 6.5Fresh water in the future
  • 6.6Choices in the use of fresh water
• 7Accessing fresh water
  • 7.1Canada
  • 7.2United States
  • 7.3Developing countries
• 8See also
• 9References
• 10Further reading
• 11External links