Awesome Geology from Space Screen Saver 

A screen saver with beautiful NASA/JPL radar images of geological formations. All photos are high-quality images. This 5-photo version is free, the Gold Edition has 42 photos and may be purchased at Awesome-Screens.com
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EarthBrowser 

An innovative earth simulation that combines an easy to navigate 3 dimensional globe with real-time weather, live earthquakes, webcams, volcanoes and current cloud formations. Great educational tool, a must have for avid weather watchers!
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