With three levels to choose from on each page - beginner, intermediate or advanced - this site provides a good introduction to the structure of the ocean. Included are excellent graphics and text about patterns of ocean salinity and temperature with depth, as well as surface currents, deep ocean circulation and even the water cycle. Extensive in-text links provide the means for users to explore the ... Full description.

Life Without Light presents material describing the unique animal communities surrounding deep-sea methane seep habitats in the Gulf of Mexico. Visitors can study numerous photographs and brief text descriptions of tubeworms, mussels, ice worms, and other organisms that inhabit an ecosystem that exists in total darkness. Other materials include an article on deep-sea submersibles, videos of sea life ... Full description.

The National Climatic Data Center (NCDC) is the world's largest active archive of weather data. Climate data for cities and locations throughout the U.S. and around the world are available here. Products include land-based, upper air, satellite, and marine measurements of precipitation, wind, atmospheric pressure, clouds, and solar activity. Educators and government researchers can access many of ... Full description.

This database provides access to discharge data from the original UNESCO river archive in a digital format for use by researchers and planners in the water sciences community. While this is a very good global resource, it does not present information on rivers in the United States. Full description.

This site presents average ice conditions estimated using satellite passive microwave data for the most recent month available, as well as snapshots of trends and anomalies that compare these recent conditions with the mean for the month. Full description.

This portal, published by the University of Florida/Institute of Food and Agricultural Science (IFAS) Extension, offers a selection of links to information about water management issues. There is a 'Beginner's Guide to Water Management', which provides a basic introduction to the terminology and concepts used in water management. Other links access information on management in coastal waters, the ... Full description.

This project examines the entire water system of an ancient city, including supply, distribution, use, and drainage. Until now, individual water system elements have been studied as archaeological objects, but infrequently subjected to analysis by such disciplines as fluids engineering and urban history. This work is part of two larger long-term studies, the first concerning the relationship between ... Full description.

BASIN is a local community service network offering public access to environmental information. BASIN's initial focus is on water in Boulder County, CO: where it comes from, goes to and how it is used. Watershed, recreation, precipitation, personal action, and community uses are major focuses in this site. 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.

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.