chapter 9

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  1. Geologic Column
    an ordered arrangement of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom.
  2. Eras
    a unit of geologic time that includes two or more periods.
  3. Period
    a unit of geologic time that is longer than an epoch but shorter than an ear
  4. epoch
    a subdivision of geologic time that is longer than an age but shorter than a period
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hmurphy
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267371
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chapter 9
Updated:
2014-03-21 20:00:23
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chapter 9
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