The degradation of irrigated soils across the once very productive "Fertile Crescent" of the Middle East was due primarily to:
A) destructive wars in the region.
B) high calcium and magnesium levels in the irrigation waters.
C) inadequate equipment and power to properly cultivate the soil.
D) poor internal drainage of the soils.
E) high levels of calcium-containing salt in the irrigation water.
D
You might also like to view...
Answer the following statement(s) true (T) or false (F)
Steel structural beams cannot be cut.
A GC would usually require performance bond from
A) each major subcontractor. B) the architect. C) the owner. D) the owner and the architect. E) the owner, architect, and the consultants.
The proper use of artificial insemination almost eliminates the likelihood of disease being transmitted through mating
Indicate whether the statement is true or false
For what reason are Category II and Category III furnaces rare?
A) The temperature of the system makes it hard to repair. B) These furnaces are no longer manufactured. C) These furnaces are not reliable and require more maintenance. D) The venting system is made of a material that is no longer available.