University Corporation for Atmospheric Research
Ucar: The Water Cycle
This site provides a comprehensive introduction to the water cycle. Students construct a model to simulate parts of the water cycle. Includes background information, links to standards, lesson plans, and assessment ideas.
PBS
Pbs Learning Media: Water Vapor Circulation on Earth
This simulation from the National Center for Atmospheric Research portrays annual patterns in water vapor and precipitation across the globe, illustrating general circulation patterns as well as seasonal and regional variation. [4:52]