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how do scientists determine when each of earth’s major eras ends?

Sagot :

TurboMini

Answer:

Eons are divided into smaller time intervals known as eras. In the time scale above you can see that the Phanerozoic is divided into three eras: Cenozoic, Mesozoic and Paleozoic. Very significant events in Earth's history are used to determine the boundaries of the eras. Eras are subdivided into periods.

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