Water
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Water is a ubiquitous chemical substance that is composed of hydrogen and oxygen and is essential for all known forms of life.
Refers to the chemical compound, H2O, as well as its liquid form.
At atmospheric temperatures and pressures, it can exist in all three phases: solid (ice), liquid (water), and gaseous (water vapor).
It is a vital, life-sustaining part of life on earth.
[edit] Residence times
| Reservoir | Average residence time |
|---|---|
| Oceans | 3,200 years |
| Glaciers | 20 to 100 years |
| Seasonal snow cover | 2 to 6 months |
| Soil moisture | 1 to 2 months |
| Groundwater: shallow | 100 to 200 years |
| Groundwater: deep | 10,000 years |
| Lakes | 50 to 100 years |
| Rivers | 2 to 6 months |
| Atmosphere | 9 days |
[edit] Also See
[edit] References
- Water Wiki [1]
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