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What is an era broken up into?

User Zlandorf
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Answer:

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.

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User Anoosh
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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.
User Rajeev Bera
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