Within the Sahel, __________ have/has impeded progress in the region's effort to establish stable governments and control the land and resources within its borders.
a. political borders
b. climate change
c. political ideologies 0
d. desertification
e. fundamentalism
a. political borders
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Middle-latitude cyclones in the Northern Hemisphere:
A) rotate counterclockwise. B) travel from east to west. C) are large high-pressure systems. D) have cold fronts but not warm fronts.
From this cross section of the Grand Canyon, what is the boundary between the various Precambrian rocks and the Paleozoic sedimentary units?
A. It generally is an unconformity and represents more time in the right part of the diagram than in the left part of the diagram. B. It is a depositional contact, probably representing only a short period of geologic time. C. It is an angular unconformity in most places and a nonconformity where it overlies granite. D. All of these.
Which of the following is true when comparing the hydrolysis of esters in acidic solution with the hydrolysis of esters in basic solution?
A) Both the acid and the base are true catalysts of the hydrolysis reaction. B) Neither the acid nor the base is a true catalyst of the reaction. C) The acid is a true catalyst, but the base is a reagent and must be present in the appropriate stoichiometric amount. D) The base is a true catalyst, but the acid is a reagent and must be present in the appropriate stoichiometric amount.
Substances that degrade the metals that make up storage tanks or equipment are called __________.
A. alkaline caustic agents B. toxics C. ignitables D. corrosives