This program provides an overview of the issues surrounding the construction of the Three Gorges Dam across the Yangtze River in China. When it is completed, this dam will produce the energy of 15 nuclear power plants and tame some of the river's deadliest floods. However, it is also the subject of much controversy. Topics include the loss of important archaeological, cultural, and paleontological ... Full description.

CRYosphere SYStem in Canada (CRYSYS) provides information on the Earth's cryosphere and its relation to the climate system. Contents include facts about snow, lake ice, sea ice, permafrost, and glaciers and ice caps. A photo gallery offers several images of many cryospheric phenomena. Full description.

This set of slides shows imagery of clouds as seen from above, in space, by various satellites and space shuttle missions. Each slide is accompanied by a brief caption describing the feature being shown and the satellite or shuttle mission from which the photo was taken. The slides are available as downloadable high-resolution TIF files, or they can be purchased from Lunar and Planetary Institiute's ... Full description.

This article describes ice worms (Mesenchytraeus solifugus) that live on glaciers in southern Alaska, the Coastal range and British Columbia, and in the Olympics and North Cascades as far south as Mt. St. Helens. Pictures of the ice worms and information on their habitat, physiolology, diet, and behavior are provided. Full description.

This site uses a picture of a covered swimming pool as an example of a watershed and describes real-world watersheds and their processes, including precipitation, infiltration, evaporation, transpiration, and storage. Links to an interactive rainfall calculator and to related websites are included. Full description.

Hubble Snaps Orion in Picture-Perfect Glory is an article from the Amazing Space science newspaper, The Star Witness. The articles reflect the content of current Hubble Space Telescope press releases but are written foe upper elementary to early middle school students. These science content readings identify and define scientific words and phrases that might be new to the student. Discussion questions ... Full description.

This is an image of Mars taken by the Hubble Space Telescope. You will also find information about the climate and weather conditions on Mars. Full description.

This color brochure answers common questions about the aurora, including its cause and explanations of its colors, shapes, and location. It lists resources for further study. Full description.

This Web site explores the desire shared by past civilizations and today's society to observe and study the sun. It features two interactive modules, which include satellite images, aerial photographs, panoramic pictures, time-lapse videos and other multimedia. Each module is focused on a different ancient culture: Maya in the Yucatan and Native Americans in Chaco Canyon. The site is a collaboration ... 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.