In addition to dams and levees, what are two other measures that may be taken to control flooding? What will be an ideal response?
Floodways and reforestation of cleared land.
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Which of the following is the most accurate definition of economics?
A) the study of environmental systems and their monetary value B) the study of conversion of monetary units between nations C) the study of making money, goods, and services D) the study of tax laws, banking, and monetary policy E) the study of how humans use potentially scarce resources to meet demand
Though Khartoum and Urumqi both have dry BW climates, temperatures are much more variable for Urumqi. Why? 
A. Khartoum's latitude B. Urumqi's latitude C. Urumqi's rain shadow D. Khartoum's rain shadow
Once salt is dissolved in water the:
A. positively charged sodium cation is surrounded by the negative side of encircling water molecules. B. negatively charged sodium cation is surrounded by the negative side of encircling water molecules. C. positively charged chlorine cation is surrounded by the positive side of encircling water molecules. D. positively charged sodium cation is surrounded by the positive side of encircling water molecules.
On September 22, the length of daylight is ____
a. at a maximum in the Southern Hemisphere b. at a minimum in the Southern Hemisphere c. equal in both the Northern and Southern Hemispheres d. at a maximum in both the Northern and Southern Hemispheres e. at a minimum in both the Northern and Southern Hemispheres