## Question

###### What are the the four main periods of time of Earth’s history from oldest to youngest?

What are the the four main periods of time of Earth’s history from oldest to youngest?

## Answers

The four main ERAS are, from oldest to youngest: PreCambrian, Palaeozoic, Mesozoic and Cenozoic. Periods are a finer subdivision in the geological time scale.

## Explanation:

However, more recently the Pre-Cambrian Era has been subdivided into the Proterozoic, Archean and Hadean Eras.

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