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The Tigris & Euphrates, Indus, Nile, and Huang He river valleys became centers of early civilization because of the -

A - Moderate climates and annual flooding
B - Borders and elevations that were easy to defend.
C - Fresh water for crop irrigation and fertile soil.
D - Rich deposits of metals for making tools.

User Oliver Dixon
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1 Answer

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11 votes
I would have to say B
User Catcon
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