Google Earth 5.0 (Beta) Free

New! in Earth 5.0 (beta)
See global changes with decades of historic imagery
If you've ever wondered how your neighborhood has changed throughout time, Google Earth now gives you access to the past. With a simple click, check out suburban sprawl, melting ice caps, coastal erosion, and more.
Dive beneath the surface of the ocean
In the new ocean layer, you can plunge all the way to the floor of the sea, view exclusive content from partners like BBC and National Geographic, and explore 3D shipwrecks like the Titanic.
Track and share your paths with others
Take placemarks a step further and record a free-form tour in Google Earth. Simply turn on the touring feature, press record, and see the world. You can even add a soundtrack or narration to personalize the journey.

(Source : http://earth.google.com/tour.html)

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