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An explanation of the asteroid hypothesis

Image caption:
Luis Alvarez hypothesized that the asteroid had blown millions of tons of dust into the atmosphere, blotting out the sun, stopping photosynthesis and plant growth and hence, causing the global collapse of food webs and resulting in a major extinction.

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If you use this image in your own non-commercial project please credit it to the University of California Museum of Paleontology's Understanding Science (http://www.understandingscience.org).


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