The Degradation of Irrigated Soils Across the Once Very Productive

question 2

Multiple Choice

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

• A)high calcium and magnesium levels in the irrigation waters
• B)high levels of calcium-containing salt in the irrigation water
• C)inadequate equipment and power to properly cultivate the soil
• D)poor internal drainage of the soils
• E)destructive wars in the region