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Disappearance of dinosaurs theory

Question:  What is the latest information on the disappearance of 
the dinosaurs? Causes?
 newton guest5

Answer:
There are two catastrophy theories:
1) impact of a large meteor or comet
2) massive vulcanism
both theories involve huge amounts of dust in the upper atmosphere,
reflecting sunlight and causing severe cooling at the earth's
surface.  There was an excellent review of the two theories about
two years ago in Scientific American.
 
--- Jade

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