Geologic_Time_Lecture7_posting

Geologic_Time_Lecture7_posting - The scientific method...

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Unformatted text preview: The scientific method Early hourglass methods The radioactivity clock Properties of radioactivity Daughter growth and parent decay Isotopic ages Useful parent-daughter pairs Chapters 11: Telling Geologic Time Next lecture: Finish Chapter 11 One reason geology is hard is because the Earth is so big we can only see a little bit at a time, and only on the outer skin. Even the ocean floor is difficult and expensive to visit. Another reason is its age. Photograph by Margaret Bourke- White/Time Life Pictures/Getty Images 402 Years and 3 Weeks Ago Our perspective of the world changed fundamentally when we developed the technological and mental tools to look upward and outward. This process continues today. The Scientific Method One version (of many similar ones) Another, simpler version: Continually ask the question: How will I know if Im wrong? Try to answer it with observations of nature. Lake varves (sediments deposited annually) Massif Central, France Charles Lyell (early 1800s) Deposit 215 meters thick x 15 varves/cm x 100 cm/meter x 1 varve/year = 322,500 years Can you measure the age of a lake? The scientific method Early hourglass methods The radioactivity clock Properties of radioactivity Daughter growth and parent decay Isotopic ages Useful parent-daughter pairs Chapters 11: Telling Geologic Time Next lecture: Finish Chapter 11 Sodium (Na)...
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This note was uploaded on 03/20/2012 for the course GEO 303 taught by Professor Leon during the Fall '08 term at University of Texas at Austin.

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Geologic_Time_Lecture7_posting - The scientific method...

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