This USGS site provides a comprehensive look at the water cycle. The information is conveniently divided into the following topics: Storage in ice and snow, Precipitation, Snowmelt runoff to streams, Infiltration, Ground-water discharge, Ground-water storage, Water storage in oceans, Evaporation, Condensation, Water storage in the atmosphere, Transpiration, Surface runoff, Streamflow, Springs, and Freshwater storage. Each topic includes extensive information and links to additional sources. This content resource could be used by teachers as a source of data and information and for the printable diagram of the water cycle. The entire site could be used by middle grade students studying the water cycle. Additionally students studying physical changes, specifically evaporation and condensation, would find these sections of the resource to be very helpful. (ts)