Howard Hughes Medical Institute
Hhmi: Biointeractive: Earth Viewer
Watch the earth change with this interactive app? What did Earth look like 250 million years ago? Or 1 billion years ago? Or 4.5 billion years ago? What was the climate like in the deep past? Find the answers with EarthViewer, an...
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.