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  • A geologic time scale



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  • Geological Time-Scale



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  • changes throughout Earth#39;s



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  • The Geologic Time Scale,



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  • Geologic Time Scale



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  • geological time scale chart.



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  • So called geological eras. Is



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  • average over geologic time



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  • the Geological Time Scale



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  • •The geologic time scale is



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