Vocab

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Author:
gkite
ID:
267852
Filename:
Vocab
Updated:
2014-03-25 08:56:39
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Vocab
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Description:
vocab of science
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  1. Paleozoic Era
    542 million years ago and ended about 251million years ago
  2. Mass Extinction
    enirmous number of species died
  3. Mesozoic Era
    Began 251 million years ago and ended about 65 million years ago.
  4. Cenozoic Era
    Division of geologic time that began 65 million years ago and includes the present period.
  5. Precambriam time
    Division makes up 88% of earth's history. the time interval that began with the formation of earth and ended about 542 million years ago
  6. Epochs
    detailed fossil record may allow scienteist to divide a period into shorter time
  7. Periods
    Eras are divided into shorter time units
  8. Eras
    eon divided into shorter units
  9. 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.

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