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Water cycle
continuous movement of water on, above and below the surface of the Earth / From Wikipedia, the free encyclopedia
The water cycle (or hydrological cycle) is the cycle that water goes through on Earth.[1]
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/9/94/Water_cycle.png/640px-Water_cycle.png)
Water is essential for life as we know it. It is present throughout the Solar System, and was part of the Earth from its formation. The source of the water was the same as the source of the Earth's rock: the cloud particles which condensed in the origin of the Solar System.[2]