PBS
Pbs Learning Media: Greenland Ice Sheet Project 2: A Record of Climate Change
Using images and graphs, this interactive resource illustrates scientists' efforts to study Earth's climatic history for the last 250,000 years by drilling into the Greenland Ice Sheet and examining ice cores. Includes background reading...
Khan Academy
Khan Academy: Gallery: Earth From Space
These satellite images of Earth shows some astonishing things about our planet and our relationship with it.