alvarez hypothesis

Cultural Dictionary
Alvarez hypothesis [(al-vuh-rez)]

The theory that the mass extinction that involved the dinosaurs and many other living things was caused by the impact of a large asteroid on the Earth sixty-five million years ago.

Note: The hypothesis is named after the father-and-son team of scientists Luis and Walter Alvarez, who first suggested it.
Note: Evidence indicates that the asteroid fell in the Yucatan peninsula.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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