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Mathematics 21 Online
OpenStudy (anonymous):

The Great Rift Valley is a 3,700-mile-long geographic trench. It runs north-south from Syria in the Middle East to Mozambique in eastern Africa. Which of the following is likely to be true of this geographic feature's impact on human migration? A. it had no impact on human migration B. it encouraged east-west migration C. it formed a barrier that discouraged east-west migration D. it discouraged north-south migration

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