This site offers information on many aspects of water, including text, pictures, data, maps, and an interactive center where users can offer opinions and test their water knowledge. Main topics include: water basics, Earth's water, water use, and special topics such as acid rain, saline water and other water-quality issues. Links to other water-related sites are also provided. Full description.

This news article discusses data on Jupiter's moon Europa returned by NASA's Galileo and Voyager spacecraft and the possibility that an ocean of liquid water might exist on Europa and, with it, the possiblilty for extraterrestrial life. Full description.

This is part of the U.S. Geologic Survey's Water Science for Schools website. It consists of a set of links to other parts of the site dealing with groundwater-related topics such as groundwater flow and distribution, trends in groundwater use, importance of groundwater, and groundwater quality. Graphic illustrations and photographs are provided. Full description.

Watersheds are those land areas that catch rain or snow and drain to specific marshes, streams, rivers, lakes, or to ground water. This site allows users to locate their watershed by city, county, state, or region. Links provide information about stream flow, water use, conservation efforts, demographics, forest riparian habitats, science in your watershed, water discharges, and assessment of watershed ... Full description.

This learning system provides a variety of materials on Earth and space sciences, such as images, movies, animations, and data sets. Students, teachers, and the general public can access information on the sun and space weather, astronomy, our planet and solar system, current space missions, space-related mythology and art, and geology. For teachers, there are links to tools for navigating the site, ... Full description.

This glossary provides an extensive alphabetical listing of groundwater-related terms. Full description.

This interactive map and database provides information on thousands of stream and river gauges in the 50 States, Guam, American Samoa, and Puerto Rico. Users can access information on current flooding, drought, or other hydrologic conditions, forecast outlooks for stream and river flow, and archived historical data. Full description.

Users can study an introduction to hydrologic techniques, questions, and processes. An extensive glossary of terms from the entire field of surface-water hydrology is included. References and a list of links to specific topics are also included. Full description.

This image is part of the U.S. Geological Survey's Water Science for Schools website. Other imagery includes photographs of water being measured and sampled, being used in various ways, and illustrations of how human activity influences the water system. Written descriptions of activities being shown are provided. Links to other parts of the Water Science for Schools website are also present. Full description.

This guide provides a brief introduction to the hydrologic cycle and related concepts. Users can choose from a set of links to pages which explain the distribution of water among the oceans, land, and atmosphere, and the mechanisms by which water is moved between its various sinks and sources. Full description.