Thursday, October 13, 2005

 
Isn't Google Earth just fantastic? I could just use it to explore the world for hours. Take this satellite view:



This is the Manicouagan Crater in northern Canada, one of the oldest impact craters known - formed during a tremendous impact about 200 million years ago. It now supports a 45-mile diameter hydroelectric reservoir in the telltale form of an annular lake - that is the same size as the M25 motorway! The crater itself has been worn away by the passing of glaciers and the weather but the hard rock still shows much of the impact structure.

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