The geologic time divides the history of the earth based on

The geologic time divides the history of the earth based on - GED Prep

Question

The geologic time divides the history of the earth based on life-forms that have existed during specific time from the time it was created. The divisions are called geochronological units (Geo means rock and chronology means time). The chart below shows how this geologic time is measured;

Which statement accurately describes the relationship between a period in geologic history and an era in geologic history?

Answers

Eras are comprised of three to five periods.
Periods are comprised of multiple eras.
An era lasts for a shorter amount of time than a period.
correct

A period is an element of time found in an era

Explanation

From the geologic time scale, an era in a long time span of time, and is divided into several periods. Therefore, a period is an element found in an era. The periods are further subdivided into epochs.

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