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g. How is the clay mineral glauconite used to measure the age of sedimentary rocks? What problem exists with this radiometric dating method? h. Relative to C¹4 dating, what is meant by "old carbon" and rocks being "born old"? Why do tree rings and carbon dates not always agree in age? Explain. i. How are fission tracks measured? What age of materials is best measured by this method? Why?

g. How is the clay mineral glauconite used to measure the age of sedimentary rocks? What problem exists with this radiometric dating method? h. Relative to C¹4 dating, what is meant by "old carbon" and rocks being "born old"? Why do tree rings and carbon dates not always agree in age? Explain. i. How are fission tracks measured? What age of materials is best measured by this method? Why?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
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**Transcription of Educational Text with Diagram Explanation** --- **Text on Dating Methods and Geological Time** 1. *K-Ar Dating on Biotite Crystal*: - The K-Ar date on a biotite crystal was 160 million years. Assuming all these values are useful, what overall history of this rock can be given? 2. *Glauconite in Dating Sedimentary Rocks*: - How is the clay mineral glauconite used to measure the age of sedimentary rocks? What problem exists with this radiometric dating method? 3. *C14 Dating and Old Carbon*: - Relative to C14 dating, what is meant by "old carbon" and rocks being "born old"? Why do tree rings and carbon dates not always agree in age? Explain. 4. *Fission Track Method*: - How are fission tracks measured? What age of materials is best measured by this method? Why? 5. *Uranium Isotopes in Earth's History*: - How do we know that the Earth once contained twice as much U238 and 40 times as much U235 as it currently does? What effect would that have on volcanic eruption, heat flow, and continental drift, if any? Explain. **9. Great Span of Geologic Time, Human Time versus Geologic Time** a. In the text, the divisions of geologic time and geologic events were compared to a 24-hour day. Other comparisons have been made relative to tall buildings. How would such a comparison be made to the Willis (Sears) Tower in Chicago or the Empire State Building? *Note: There are no graphs or diagrams present on this page.*
Transcribed Image Text:**Transcription of Educational Text with Diagram Explanation** --- **Text on Dating Methods and Geological Time** 1. *K-Ar Dating on Biotite Crystal*: - The K-Ar date on a biotite crystal was 160 million years. Assuming all these values are useful, what overall history of this rock can be given? 2. *Glauconite in Dating Sedimentary Rocks*: - How is the clay mineral glauconite used to measure the age of sedimentary rocks? What problem exists with this radiometric dating method? 3. *C14 Dating and Old Carbon*: - Relative to C14 dating, what is meant by "old carbon" and rocks being "born old"? Why do tree rings and carbon dates not always agree in age? Explain. 4. *Fission Track Method*: - How are fission tracks measured? What age of materials is best measured by this method? Why? 5. *Uranium Isotopes in Earth's History*: - How do we know that the Earth once contained twice as much U238 and 40 times as much U235 as it currently does? What effect would that have on volcanic eruption, heat flow, and continental drift, if any? Explain. **9. Great Span of Geologic Time, Human Time versus Geologic Time** a. In the text, the divisions of geologic time and geologic events were compared to a 24-hour day. Other comparisons have been made relative to tall buildings. How would such a comparison be made to the Willis (Sears) Tower in Chicago or the Empire State Building? *Note: There are no graphs or diagrams present on this page.*
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