What are the divisions in the geologic time scale based on?
A. Changes in the fossil record every billion years
B. Changes in the fossil record every million years
C. Gradual changes in the fossil record
D. Sudden changes in the fossil record
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Answer:
A
Explanation:
The history of the earth is broken up into a hierarchical set of divisions for describing geologic time. As increasingly smaller units of time, the generally accepted divisions are eon, era, period, epoch, age.
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The divisions in the geologic time scale are based on -
A. Changes in the fossil record every billion years
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