A gateway to 16,000 articles, multimedia, a new dictionary, and our world atlas. Water is both on and under the earth's surface and in its atmosphere as well. See where the sources can be found globally, and learn about the issues that threaten water's quality.
Water is cycled physically and in the process can be redistributed globally.
See the big picture here. Comprehensive, outstanding presentation of the location of global water sources and the specifics of the water cycle.