100 Points!! Brainliest please help! The geologic time scale is not divided by day or years. It is divided into different types of categories. What are the four main time divisions that are used for the geologic time scale and what determines are they are divided?

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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. Eras are subdivided into periods.

Explanation:

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