jonathanboughrum jonathanboughrum
  • 23-05-2020
  • Biology
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What are geologic time periods divided up by?

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LEAH864
LEAH864 LEAH864
  • 23-05-2020

Answer:

Eons are divided into smaller time intervals known as eras. In the time scale above you can see that the Phanerozoic is divided into three eras: Cenozoic, Mesozoic and Paleozoic. Very significant events in Earth's history are used to determine the boundaries of the eras.

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