Chapter 9

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  1. Geologic Column
    Ordered arrangement of rock layers.
  2. Era
    The eon is divided into smaller units of geologic time.
  3. Periods
    Eras are divided into shorter time units.
  4. Epochs.
    To divide a period into shorter time units.
  5. Evolution
    The gradual development of new organisms from preexisting organisms.
  6. Precambrian Time
    The time interval that
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twrieden
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Chapter 9
Updated:
2014-03-21 14:49:17
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Chapter 9
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