How is geologic time organized on the geologic time scale?

a. millennia and then smaller periods based on geologic and biologic events that occurred.

b. eras and then smaller millennia based on geologic and biologic events that occurred.

c. periods and then smaller eras based on geologic and biologic events that occurred.

d. eras and then smaller periods based on geologic and biologic events that occurred.

D. Eras and then smaller periods based on geologic and biologic events that occurred.

Explanation:

Geologic time corresponds to a chronological scale that encompasses the billions of years of planet Earth, from its origin to the present day. Geologic time is represented on the geological time scale and is divided into four units, namely: eons, ages, minor periods and epochs. This division is based on geological and biological events that have occurred since the formation of the earth to the present day.

We need to distinguish between the geological timescale and the historical timescale. Geologic time refers to the process of the emergence, formation and transformation of planet Earth. Historical time, in turn, refers to the emergence of human civilizations and their capacity for written communication.

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