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) poor internal drainage of the soils
C) high levels of calcium-containing salt in the irrigation water
D) inadequate equipment and power to properly cultivate the soil
E) destructive wars in the region
B
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Explain how the center line is used in the accompanying figure.
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