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B.C. (before Christ) and A.D. (after death)(relating to after Christ died) are the two broad spans that divide earth's history, with a 33 year span between B.C. and A.D. because 33 years is the age of Christ, and no one can decide where B.C. should end and A.D. should start, so they leave a blank thirty three years of unknown.

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Q: What two broad spans of time divide earth's history?
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