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.

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.

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 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.

The Zion Natural History Association (ZNHA) is a non-profit organization established in 1931 to support education, research, publication and other programs for the benefit of Zion National Park, Cedar Breaks National Monument, and Pipe Spring National Monument. Visitors to this site can acess information about the scientific, educational, historical, and interpretive activities of the Association ... Full description.

This guide provides information about caves in the United States which are open to the public. The directory is arranged by state and provides locations, operating hours, and telephone numbers for all caves in the U. S. which are developed for public access. Other materials include tips for visitors, a tutorial on cave photography, and a link to the "Virtual Cave," which includes maps and photos of ... Full description.

Visitors to this site can access a variety of materials on astronomy and stargazing. Topics include stargazing tips, a monthly almanac, audio broadcasts, and links to news articles, books, and images. Full description.

Visitors to this homepage can learn about the Earth Island Institute and its mission, origins, and purpose. Materials include summaries of projects designed to promote conservation, preservation, and restoration of the Earth, a biography of the organization's founder, news articles, and information for people who wish to become involved in conservation or outreach efforts. Full description.