From NASA, a history of water on earth and a look at some of the space missions involving water.
Water cycle diagram available in 30+ languages. From U.S. Geological Survey. Also includes a trip through the water cycle.
Includes cloud formation and vocabulary related to the things that happen to water during the cycle.
Put together by three schools in Seattle, WA. Includes a look at the water cycle, weather phenomena involving water, and games.
Some statistics and a look at cloud formation.
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