Which of the following undermines African food security?
A) urban agriculture
B) fair trade movement
C) increasing yield
D) land grabs
E) all of the above
Answer: D
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A. dot distribution map B. graduated circle map C. isopleth map D. choropleth map
Which gas, contributed in part by burning fossil fuels, is used by scientists as an indicator of future global warming?
A) CO2 B) nitrogen C) oxygen D) hydrogen
The temperature of a red giant increases rapidly because ________
A) fusion increases and gives off heat B) endothermic chemical reactions occur C) exothermic chemical reactions occur D) friction from the collapse creates heat E) gravitational energy is converted to heat
A hydrograph shows
A. the length and width of a river. B. the change in the sediment load of a river. C. the change in a river's discharge over time. D. the beginning and ending elevations of a river.