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.

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 archive of climatic data houses both national and global datasets as part of the National Climatic Data Center's (NCDC) mission to describe the climate of the United States and to maintain records regarding trends and anomalies of weather and climate. Users may search the archive by data type, national or global coverage, and time period; or by resource type, such as satellite, radar, models, ... Full description.

This service allows users to locate, use, and share environmental information about watersheds where they live. Individual watersheds can be searched by map, place name, or Zip code. "Adopt your watershed" encourages individuals to become involved in stewardship and conservation of watersheds where they live. An environmental website database contains hundreds of URLs and can be searched by state, ... Full description.

The home page of the Astrophysics Science Division at Goddard Space Flight Center provides information on the division's research projects, missions, goals, and activities. Topics include the evolution of galaxies, stars, and planets; the diversity of worlds outside our solar system; the possibillity of life on those worlds; and astrophysics questions such as what powered the Big Bang, what is dark ... Full description.

This collection of links to EPA information on atmospheric ozone depletion covers topics such as the causes of ozone depletion, possible effects of ultraviolet radiation and how to protect from it, information on chlorofluorocarbons in air conditioning systems and metered dose inhalers, and lists of ozone-depleting substances. Full description.

This site offers links to maps, posters, globes, and CD-ROMS showing seafloor topography, gravity anomalies, and bathymetry. The images were derived from GEOSAT and ERS satellite data and bathymetric surveys performed by the U.S. Navy. Full description.

This site offers access to information on worldwide earthquake activity, earthquake science, and earthquake hazard reduction. Materials presented here include maps and information on recent activity in the United States or worldwide, news and highlights, and a link where users can report ground motion from an earthquake. For teachers, there is a set of quick links to photos, a slideshow, and USGS ... Full description.

This page links to several sites with reference materials covering such topics as solar storms and flares, the magnetosphere, and other issues in Sun-Earth research. Links to a glossary and to a summary of the Ulysses solar study mission are also included. Full description.

The Jet Propulsion Laboratory's (JPL) homepage provides links to spacecraft and mission information, imagery, news articles, events, features, and public services. Users can access articles and imagery from the Mars Rover and Cassini missions, images from the Spitzer Space Telescope, and an El Nino/La Nina Watch. Full description.