The Exploratorium was one of the first science museums to build a site on the World Wide Web. This homepage provides a vast array of links to science resources of many types. Teachers can access activities, publications, information on field trips to the museum, and a digital library of photos and movies. General interest materials include online versions of exhibits, a microscope imaging station, ... Full description.

This site describes the distribution and movement of water around, through, and above the Earth as water vapor, liquid water, and ice, with emphasis on the water cycle (hydrologic cycle). It is part of the U.S. Geological Survey's Water Science for Schools website. Tables and graphs are provided. The water cycle graphic is available in several languages. Full description.

Visitors can access general information on the greenhouse effect, how it works, and what impact human-produced emissions are having on the global climate. Materials presented here include discussions of the potential impacts of climate change, actions being taken to mitigate the effects, news articles and publications, tools for estimating emissions and calculating the benefits of reduction strategies, ... Full description.

This is the homepage of the SeaWiFS Project. Users can access remote imagery, datasets, information on the spacecraft and receiving stations, and data processing applications. Educational materials include a tutorial and presentation on ocean color, a teachers' guide with activities, imagery, and a teachers' workshop. Full description.

This is the homepage of the U.S. Global Research Program (USGCRP), an initiative to support research on the interactions of natural and human-induced changes in the global environment and their implications for society. Visitors can study overviews of the topics of greatest interest to the USGCRP, which include atmospheric composition, climatic variability and change, global cycles for carbon and ... Full description.

Visitors to this site can access a brief description of what a well is and how it works. Topics include the basic types of wells, well construction, and tips on preventing contamination of wells. Full description.

This resource presents information on global warming and the possible impacts of the melting of the Antarctic ice sheets and the resulting rise in sea level. Materials include a video excerpt, interviews with proponents and skeptics on the issue of global warming, maps and descriptions of how the world's coastlines might change as sea levels rise, and the study of ice cores to reveal climatic conditions ... Full description.

This is a group of frequently asked questions and answers about Earth's magnetic field and poles, the magnetic compass, magnetic reversals, and geomagnetic models. Links to maps and illustrations are embedded in the text. Full description.

This collection of images was captured by the Spaceborne Imaging Radar-C/X-Band Synthetic Aperture Radar, which was flown on two flights of the space shuttle Endeavour in 1994. Images are classified into categories for ease in searching: archaeological sites, cities, ecology and agriculture, geology, interferometry, oceans, rivers, snow and ice, and volcanoes. Full description.

Atmospheric scientists investigating the possibility that human influences are changing the Earth's climate confront a significant problem - how do we actually detect climate change? As they participate in this classroom activity, students will develop the understanding that long-term climate averages are the result of significant annual climate variability and that random climate variability makes ... Full description.