GEOLOGY

Detailed explanation-1: -The geologic time scale is the “calendar”for events in Earth history. It subdivides all time into named units of abstract time. In descending order of duration, they are eons, eras, periods, epochs, and ages.

Detailed explanation-2: -The geologic time scale is divided into (from longest to shortest): eons, eras, periods, epochs and ages.

Detailed explanation-3: -Which of these segments of time is longest? From longest to shortest, the segments of time are eon, era, period, and epoch.

Detailed explanation-4: -Eons are the largest intervals of geologic time and are hundreds of millions of years in duration. In the time scale above you can see the Phanerozoic Eon is the most recent eon and began more than 500 million years ago. Eons are divided into smaller time intervals known as eras.

Detailed explanation-5: -eon = The largest unit of time. era = A unit of time shorter than an eon but longer than a period. period = A unit of time shorter than an era but longer than epoch. epoch = A unit of time shorter than a period but longer than an age.