Air pollution in major cities of developing countries is

A. Not well understood
B. Rapidly becoming less of a problem
C. Usually negligible
D. Responsible for extremely high rates of respiratory diseases
E. Decreasing because of the use of scrubbers and other technologies


Answer: D

Environmental & Atmospheric Sciences

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_____ is to liquids as vapor density is to gases.

a. Specific gravity b. Miscibility c. pH d. Viscosity

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Both the Czars and the Soviet leaders of Russia tried to gain political control over non-Russian areas through the practice of __________, which attempted to ________ other ethnic groups.

a. Russification; acculturate b. Russification; assimilate c. central planning; assimilate d. central planning; acculturate

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A cloud of interstellar gas is held together by

A. the gravitational force. B. electromagnetism. C. infrared radiation. D. All of the above.

Environmental & Atmospheric Sciences