Ayear is divided into months, weeks, and days. the geologic time scale is also
divided into time categories. what are the time divisions that are used for the
geologic time scale and what determines how they are divided?

Geologic time is known to be divided into four long segments which are termed as the eons. It determines the time and probable historic events which occurred in this time.

The four long segments of the eon area:

The Phanerozoic eon is the eon which can be recognized by the division of eras. The eras of the Phanerozoic eon are: Paleozoic, Mesozoic, and Cenozoic. Eras are further divided into periods.

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