Add to ORKGThis U.S. Geological Survey (USGS) water resources site provides comprehensive coverage of water related issues, and includes several interactive quizzes and activities for children. Here you will find information on many aspects of water, along with pictures, data, maps, and an interactive center. Topics include: Earth's water, Water basics, Water use, Water Questions and Answers, Activity center, Picture Gallery, Glossary, and Related Water Links. A special topics section tackles current problems in water science, including acid rain and water quality. The site also focuses on water use issues and attempts to raise student awareness of water conservation. Educational levels: High school, Intermediate elementary, Middle school, Primary ele...