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 site provides an explanation for cloud formation and seeks to correct myths or misconceptions about how clouds form. Water vapor, condensation, and evaporation are discussed in the context of dew-point temperature and saturation. Educators and anyone explaining cloud formation will find hints on how to present the correct information and avoid misinforming their audiences. Full description.

The National Marine Sanctuary Program identifies, designates and manages areas of the marine environment of special national significance due to their conservation, recreational, ecological, historical, research, educational, or aesthetic qualities. Access information and pictures of marine sanctuaries all over the U.S. and its territories. Discover ways to get involved with the sanctuary program, ... Full description.

Classroom activities based on how scientists study active volcanoes on the deep ocean floor. Activities include: locating an earthquake epicenter, recording geological and biological information during an ocean floor traverse, creating cross-section profiles of the ocean floor, and graphing seafloor data. Resources include videos and teacher guides. Full description.

This module provides background information on El Nino and the mechanisms of the Southern Oscillation. Relationships of El Nino to climate change, weather phenomena and disease carrying organizms are also presented. Full description.

This information about the Lunar Prospector mission to the Moon discusses the possibility that ice exists on the lunar surface. The article indicates that no native water ice has been found on the moon. If ice has been found, it most likely originated from meteors and meteorites which periodically bombard the lunar surface. Full description.

The materials presented here help make the case for water conservation by residential water users. Users can study conservation tips, suggestions for leak detection and repair, and learn about program services provided by the Portland Water Bureau such as cash incentives for buying water-saving appliances, a request form for ordering conservation devices, and community events and workshops. Though ... Full description.

This site provides information on several microscopic marine algae which are toxic to humans. Examples include Alexandrium, Dinophysis, Pseudo-nitzschia multiseries, and Domoic acid. Full description.

This article discusses the possibility that water might exist on the Moon. Topics include some uses for water in space (other than drinking), where the water might be found, and the idea that it may have been 'delivered' to the Moon by comets, which are largely made of ice. Full description.

This is a copy of a news story originally written on March 1, 2001 that describes the theory of how small comets may have been at least part of the source of the water on our planet. The site also offers links to the University of Iowa's Small Comets research site and information on the ground-based measurements that are used to identify these comets. Full description.