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
Question 2
The drainage of some coastal wetland soils results in high pH due to underlying lime deposits.
Indicate whether the statement is true or false