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Assume that man's recorded history can be stretched back to 4600 years before the present. this is approximately what fraction of geologic time?
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Assume that man's recorded history can be stretched back to 4600 years before the present. this is approximately what fraction of geologic time?

User Mark Rucker
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4,600/4,540,000,000 = 0.00000101321

man's recorded history spans about 1/1,000,000 of geologic time (one one millionth)
User RiaD
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