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Author Question: Long-lived radioactive isotope pairs used in radiometric dating have half-lives of the magnitude of ... (Read 72 times)

JGIBBSON

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on: Jul 15, 2018

Long-lived radioactive isotope pairs used in radiometric dating have half-lives of the magnitude of
  ___________________ _ or ___________________ _ of years. Fill in the blank(s) with the appropriate word(s).



Question 2

The most accurate radiometric dates are obtained from ___________________ _ rocks. Only in very
  unusual circumstances can ___________________ _ rocks be radiometrically dated. Fill in the blank(s) with the appropriate word(s).



mjenn52

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Reply #1 on: Jul 15, 2018
Answer to Question 1

millions, billions

Answer to Question 2

igneous, sedimentary
igneous, metamorphic



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