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AP® Environmental Science

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Division of Geologic Time Scale

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The geologic time scale is divided into units based on

A

historical records dating back to Earth's beginning.

B

rock strata, via evidence from radiometric dating techniques.

C

fossil evidence indicating major evolutionary events in Earth's history.

D

equal units of time, including epochs, periods, eras, and eons.

E

relative thicknesses of rock layers throughout the world.