25 - isotope is always the same. Ages calculated using...

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NATS 101 25/02/2008 17:41:00 Numerical Time Unstable isotopes are key to the numerical age of Earth o An unstable nucleus may spontaneously change to a more stable from  through radioactive decay Unstable original isotope = parent Stable new isotope = daughter Half life = the time it takes for half the parent isotope to convert to daughter  atoms Isotopes have characteristic half-lives. The length of the half-life for a given 
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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 17:41:00 25/02/2008 17:41:00...
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25 - isotope is always the same. Ages calculated using...

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