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OpenStudy (anonymous):
How would you date a sample of rock that you suspect as being once of the earliest on Earth? a. use a radioactive isotope with a short half-life b. use a radioactive isotope with a long half-life c. use an index fossil d. use a microfossil
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OpenStudy (anonymous):
I think it's b use a radioactive isotop with a long half life
OpenStudy (blues):
You're right - and thanks for posting your tentative answer as well as the question!
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