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Rock of ages.(SAMPLINGS)(neon 21 observations to identify rock age)(Brief Article)
Publication: Natural History Publication Date: 01-JUN-05 Author: Reebs, Stephan
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COPYRIGHT 2005 Natural History Magazine, Inc.
If you want to know how long a rock has been exposed to the sky, measure its neon-21. Cosmic rays--energetic particles that originate in distant stars and galaxies--are constantly smashing into the atoms that make up various minerals in exposed rock. When they do, they produce neon-21, a stable...
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