The degradation of irrigated soils across the once very productive "Fertile Crescent" of the Middle East was due primarily to _____.

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The degradation of irrigated soils across the Fertile Crescent was due primarily to poor internal drainage of the soils, leading to waterlogging and salinization. The region's topography and the use of ancient irrigation techniques contributed to inadequate drainage, leading to a buildup of salts in the soil.

The Degradation of Irrigated Soils Across the Once Very Productive