What led to a spike in world wheat prices in 2010?
A. the Russian invasion of Georgia
B. a heat wave that resulted in the Russian government's decision to ban wheat exports.
C. the Common Wealth of Independent States' (CIS) attempt to corner the wheat market.
D. Russia joining the World Trade Organization.
B. a heat wave that resulted in the Russian government's decision to ban wheat exports.
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Pyroclastic materials include:a
volcanic bombs, pillow lavas, and volcanic ash. b. volcanic bombs, lapilli, and volcanic ash. c. pillow lavas and nuée ardentes. d. nuée ardentes and lahars. e. none of these
Urbanization influences soil erosion processes primarily because of
A) increased runoff from impermeable surfaces B) increased soil pollution from street runoff C) vegetation removal and soil disturbance at construction sites D) desiccation of soils through draining and pumping of water
A hyperconcentrated flow has between 20 and 47 percent sediment by volume
a. True b. False
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A) eastern; away from B) eastern; toward C) western; away from D) western; toward