ch 9

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inunes
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267365
Filename:
ch 9
Updated:
2014-03-21 15:03:26
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ch 9
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ch 9
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  1. geologic column
    an ordered arrangement of rock layers
  2. era
    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 era
  4. epoch
    a subdivision of geologic time
  5. evolution
    the process of change by which new species develop from preexisting species over time
  6. Precambrian time
    the interval of time in the geologic time scale from earths formation to the beginning of the Paleozoic era,

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