In Sub-Saharan Africa, petroleum accounts for 80% or more of the export earnings of Chad, Republic of Congo, Gabon, and:
A) South Africa
B) Nigeria
C) Ethiopia
D) Mozambique
B
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What does a total fertility rate of 2.1 indicate?
A) infant mortality rate B) rate of natural increase (RNI) C) crude birthrate (CBR) D) life expectancy E) total fertility rate (TFR)
Open dumping is a waste disposal method that is
A. never implemented because of associated risks of groundwater pollution. B. common in most developed countries. C. predominant in most developing countries.
Biomass includes all:
A. Material in an ecosystem B. Biological material C. Things that are living at a given time D. Living and nonliving things E. Matter produced by primary producers
Gravity waves
A) do not actually involve gravity. B) have an alternating pattern of high and low pressure. C) are not actually waves. D) are not found in the Appalachian mountains. E) all of the above