Question

What is an era broken up into?

Answer 1

an era, is split into three geological periods called eons: Hadean, Archaean and Proterozoic. The latter two are sub-divided into several eras as currently defined.

Step-by-step explanation:

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Answer 2

an era, is split into three geological periods called eons: Hadean, Archaean and Proterozoic. The latter two are sub-divided into several eras as currently defined.