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Why is the geologic time scale used to show Earth's history?
What methods did geologists use when they first developed the geologic time scale?

User Breaktop
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It is used to shows earths history to show and teach and tell everybody there past and hirstory
User Ljacqu
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It is used in the earth’s history because it shows how old the earth in general. Geologist would use rocks layers to study on to see how old it is.
User Shahzad Barkati
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