Desertification occurring in the grasslands of the Sahel, bordering the Sahara, is the result of
A) careless overgrazing by local herders.
B) expanding beef production for U.S. and European markets.
C) a complex set of environmental, cultural and political economic factors.
D) industrialization and urbanization.
E) droughts and other acts of nature or God.
Answer: C
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Which of the following is a member of the sulfide mineral group?
A. calcite B. mica C. gypsum D. pyrite
Point sources of pollution include all of the following except
A. wastewater from a factory. B. organic matter discharged from a meat-packing plant. C. a septic tank leaking sewage. D. salt runoff from roads.
The world's population of urban settlements exceeded that of rural settlements for the first time in human history in ________
A) 1990 B) 1995 C) 2000 D) 2004 E) 2008
Most periglacial environments at high latitudes are seasonally snow-free
Indicate whether the statement is true or false