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Unformatted text preview: In this case about 1.25 billion years By knowing rock chemistry, we chose a stable isotope which does not form with the rockits presence is due solely to decay. Measuring the relative amounts of the two isotopes and knowing the half life of the radioactive isotope tells us the age of the rock....
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This note was uploaded on 09/12/2011 for the course AST 2002 taught by Professor Britt during the Spring '08 term at University of Central Florida.
- Spring '08