Smithsonian Institution
Smithsonian Magazine: Eco Center: The Oceans
Students explore the potential problems and fascinating phenomena of the oceans. Some topics investigated are climate change, nutrient pollution, and fishing. The resource consists of a quiz, slideshows, articles, and video clips.
US Environmental Protection Agency
Epa: Water Resources: Water Bodies
Learn about EPA's work to protect and manage water resources and what you can do to help.
Other
Environmental Challenges in Farm Management: Change in Habitats: Eutrophication
This site from the University of Reading provides the definition of eutrophication as well as further information about this naturally occurring phenomenon.