chapter 9

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thumes
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267351
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chapter 9
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2014-03-21 14:26:09
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  1. geologic columm
    an ordered arrangement of rock layers that is based on the relative age of the rocks and in which the oldest rocks are at the bottom.
  2. era
    a unit of geologic time that includes two or more period.
  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 that is longer than an age but shorter than a period.
  5. evolution
    the process of change by which new species develop from preexisting species over time
  6. paleozoic era
    the geologic era that followed precambrain time and that lasted from 542 million to 251 million years ago
  7. precambrain time
    the interval of time in the geologic time scale from earths fromation to the begining of the paleoic era from 4.6 billion to 542 million years ago.
  8. mass extinction
    an episod during which large number of species become extinct
  9. mesozoic era
    the geologic era that lasted from 251 million to 65.5 million years ago; also called the age of reptiles.
  10. cenozoic era
    the current geologic era, which began 65.5 million years ago; also called the age of mammals

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