Geologic history is divided into eras, periods, and epochs based on the
1. type of rock deposited at different times throughout history
2 half-life of radioactive isotopes found in rocks
inferred movements of Earth's landmasses
4.
fossil evidence found in bedrock



Answer :

Final answer:

Geologic history is divided into eras, periods, and epochs based on fossil evidence found in bedrock.


Explanation:

Geologic history is divided into eras, periods, and epochs based on fossil evidence found in bedrock. This division helps scientists understand the order of events on Earth and track the changes in geology and life forms over time. The geologic time scale provides a framework for organizing Earth's history and the evolution of life based on significant events.


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