Why do northern and southern Africa appear much darker in Figure 20-4b than in 20-4a?
The question is based on Figure 20-4, infrared images of Africa taken 9 hours apart.
What will be an ideal response?
About noon in (b), so the high Sun has warmed the surface.
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Azerbaijan's economy is highly dependent upon which export?
A) coal B) oil C) uranium D) natural gas E) hydropower
Along its length, the Colorado River
A. is greatly reduced in volume by heavy use and evaporation loss from reservoirs. B. becomes less saline toward its confluence with the Sea of Cortez. C. flows entirely over insoluble igneous rocks. D. receives considerable water through ground water discharge.
Which data were used to develop the hypothesis of continental drift?
A. the distribution of fossils B. the shape of the continents C. the distribution of glacial deposits and directions of glacial scratch marks D. All of these.
Who formed the proletariat in industrial Europe?
A) aristocracy (former nobles) B) guild members C) religious orders D) wealthy landed elite (who were often tied to the Church) E) working class (former peasants and serfs)