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Unformatted text preview: isotope is always the same. Ages calculated using radioactive decay tell us when the minerals in a rock first solidified from a molten state or formed through metamorphism Isotopes with longer half-lives are better for dating older rocks. While shorter half lives are better for dating younger rocks. 25/02/2008 16:59:00 25/02/2008 16:59:00...
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- Spring '08