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What do scientists use to divide the geologic time scale? Major divisions in the fossil records Major divisions in the sedimentary rock layers Evidence for catastrophic events in Earth's history Major
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What do scientists use to divide the geologic time scale?

Major divisions in the fossil records
Major divisions in the sedimentary rock layers
Evidence for catastrophic events in Earth's history
Major changes in mineral deposits in the rock layers

User Geekchic
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The use Major changes in mineral deposits in the rock layers. 
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