NASA
Nasa: Visible Earth
From NASA, "Images, visualizations, and animations," that students will find extremely interesting and helpful in their study of the earth. Includes pictures of environmental impacts, erosion, coastal processes, atmosphere, and lots more.
Rice University
Museums Teaching Planet Earth: Hydrosphere
This tutorial looks at the hydrosphere, that component of the earth that is liquid water such as rivers, streams, oceans, and so on.
Center for Educational Technologies
Nasa: Classroom of the Future: Spheres: Hydrosphere
Use this site to learn about the millions and trillions of gallons of water that covers the earth, known as the hydrosphere.
Exploratorium
Exploratorium: Global Climate Change: Hydrosphere
Use this site to explore real scientific data relating to the hydrosphere. With this information you can gather evidence, test theories, and come to conclusions. Click on the data examples to view a full scale version.