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The geologic time scale is divided from longest to shortest duration in the following order which is eons, eras, periods, epochs and ages.Eons are the longest portions of geologic time which is almost equal to one billion years long time duration. Era refers to the duration of time less than eons but greater than a period. For example: Cenozoic Era, Mesozoic Era. Epoch refers to the unit of time shorter than a period but longer than an age. An Epoch lasts several million years. The geologic time scale is the calendar for events in Earth history. It makes it easier for the scientist to quantify large time durations to a range which can be normally imagined by a common man and so the chronological study of geophysical events becomes feasible.Learn more about Geologic time scale at:brainly.com/question/15954144#SPJ4