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OpenStudy (anonymous):
What length of time does the geological scale cover? a. 2.0 million years b. 4.6 billion years c. 20.5 billion years d. 10.1 million years
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OpenStudy (anonymous):
@horsegirl27 @Goku-Kai
OpenStudy (anonymous):
Oh snap! That answers 4.6 mama! ;D
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