Other
Clean Ocean Action
This site defines and describes causes of ocean pollution. Easily navigated links to education, research, and current issues on pollution.
Smithsonian Institution
National Museum of Natural History: Ocean Planet: Water Pollution Toxic Materials
This site, from an archived Smithsonian exhibit, describes and illustrates the effects of toxic materials on wildlife in bodies of water.
Other
Uk Rivers Network: Finding Out About Water Pollution
Excellent site covers all types of water pollution. Hundreds of links including books, articles, organizations, specific topics.