Question

Four major eras from most recent to most ancient

Answer 1

The four main eras are, from oldest to youngest: Precambrian, Paleozoic, Mesozoic and Cenozoic.

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Answer 2

The Precambrian, Paleozoic, Mesozoic, and Cenozoic Eras

Extra information

The Geologic Time Scale is the history of the Earth broken down into four spans of time marked by various events, such as the emergence of certain species, their evolution, and their extinction, that help distinguish one era from another.