Which list places the divisions of the geologic time scale in order, from longest to shortest?

epoch, period, era

period, era, epoch

era, period, epoch

era, epoch, period

The correct answer is - era, period, epoch.

The geological times scale is divided in general to eons, eras, periods, and epochs, and the reason for this is the better classification, studying, and division of the geological past.

The eras tend to be spanning for few hundred million years, the periods few tens of millions of years, while the epochs are spanning for few million years or few hundred thousand years.

The division is made, in general, when there's a drastic change in the climate patterns on a global scale, or an extinction event.

era, period, epoch

Explanation:

The geologic time scale is a chronological dating related to the geologic structure. The primary method to determine this is the eons that are the Haden, archean and the proterozoic, and the phanerozoic.

The period of the geologic time scale is viewed from the longest to the shortest is characterized by the eon, era, epoche and then the periods wherein the era is the largest of the periods of the geologic time. As these time frames are structured as per the geologic history of the earth.

And it was not possible until the discovery of the radioactivity in 1896.

The eon describes the longest period i. e hundreds of millions of years ago.

An epoch is the subdivision has longer than age but shorter than a period.

Thus era is the longest and comprises about 80% of the timescale.