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OpenStudy (anonymous):

Eric is considering building a scale model of the geologic time scale. If the timespan occupied by modern humans is represented by a length of 1 cm on his model, how long will the model have to be to represent Earth's entire history?

OpenStudy (anonymous):

Earth is made up ~4.0 billion years ago. Try dividing that with modern human timescale and that is how long you need to model your timescale.

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