Water cycle

The water cycle (or hydrological cycle) is the cycle that water goes through on Earth.^[1]

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]

1. ↑ "The Water Cycle". Dr. Art's Guide to Planet Earth. Archived from the original on 2011-12-26. Retrieved 2006-10-24.Water cycle. [1]
2. ↑ Van Andel, Tjeerd H. 1994. New views on an old planet: a history of global change Chapter 14. 2nd ed, Cambridge. ISBN 0-521-44755-0