When was the earth born?? and which are the three main stages,ages or periods of history??
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the Earth was born 4.5 billion years ago. The three main stages of history are Ancient, Medieval and Modern.
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It extends from 4.6 billion years ago to the beginning of the Cambrian Period
The four main ERAS are, from oldest to youngest: PreCambrian, Palaeozoic, Mesozoic and Cenozoic. Periods are a finer subdivision in the geological time scale.
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