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Meteors not only culprit in mass extinction

Posted: 10/28/2006 12:00:00 AM   Reads: 209   Submitted By:jmoore   Category: Space   Source: www.msnbc.msn.com
A growing number of paleontologists say that Earth-smashing meteors cannot take all the blame for the many mass extinctions that dot our planet’s fossil record. The true causes seem to be more complex.
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