Exam 9: Geologic Time: Concepts and Principles

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Radiometric dates are most accurate from igneous rocks.

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True

The principles of uniformitarianism and superposition are both critical to assigning relative ages to a sequence of sedimentary rocks.

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Sedimentary rock unit A is cut by igneous rock unit B and is on top of sedimentary rock unit C. Which of the following sequences, from oldest to youngest is correct?

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D

dating is the most common method of obtaining absolute age dates.

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Both relative time and absolute time have been critical for geology to develop as a science.

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How old is Earth (what is a geologically reasonable maximum age)?

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Correlation is the process of matching similar rock types.

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What is a disconformity?

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Once the concept of a linear time and history were established

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Why is the principle of fossil succession important?

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Did the development of the geologic time scale depend on development of radiometric dating techniques? Explain.

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Radioactive decay is the process by which an unstable atomic nucleus is transformed into a different, more stable nucleus.

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What is the principle of fossil succession?

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What is the principle of fossil succession?

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What are isotopes of an atom?

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Geology and astronomy differ from all other sciences in that

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Why are fossils found almost exclusively in sedimentary rocks (as opposed to other types of rocks)?

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Carbon 14 dates would be useful to date rocks from the Precambrian.

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What is the importance of the principle of superposition?

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What 2 types of elements must we be able to measure very accurately when we determine the radiometric age of a rock?

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