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Feb 2 2007, 6:55 AM EST amrwaly
 
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Change:  Dinosaurs suddenly became extinct about 65 million years ago, at the end of the Cretaceous period, which was a time of high volcanic and tectonic activity. There are a lot of theories why the extinction occurred. The most widely accepted theory is that an asteroid impact caused   View changes from previous version. (Word count: 337)
Feb 2 2007, 6:52 AM EST amrwaly
 
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