Question

Suggest why it is helpful to divide the Earth's history into eras and peroid.​

Answer 1

Answer:

Eons are divided into smaller time intervals known as eras. ... Very significant events in Earth's history are used to determine the boundaries of the eras. Eras are subdivided into periods. The events that bound the periods are wide-spread in their extent but are not as significant as those which bound the eras.

Answer 2

Eons are divided into smaller time intervals known as eras. ... Very significant events in Earth's history are used to determine the boundaries of the eras. Eras are subdivided into periods. The events that bound the periods are wide-spread in their extent but are not as significant as those which bound the eras.