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Unformatted text preview: distinct ________________________ of that element. 12. Which proportion of a radioactive isotope is expected to remain in an unaltered (unreacted) state after the passage of 2 half lives? 13. Radiometric dates applied to sedimentary rocks produce ages that are_______________. Chapter 10 Page 3 14. Numerical ages for recent geologic events can sometimes be determined by the study of ________________________. 15. Uniformitarianism is succinctly summarized by which phrase? 16. Which statement best summarizes the development of the geologic time scale? 17. If the relative age of two formations (with respect to one another) is known, then the nu-merical ages for each formation can be inferred. 18. What is always the same with multiple isotopes of a single element? 19. What always varies with multiple isotopes of a single element?...
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This note was uploaded on 11/08/2011 for the course BIOL 243 taught by Professor Datt during the Spring '08 term at South Carolina.
- Spring '08