Air pollution is

A) a form of photochemical smog.
B) gaseous sulfur and phosphorus.
C) a concentration of a trace substance at a level greater than occurs in average air.
D) a concentration of a trace substance at a level greater than one percent.
E) concentrated in tropical regions.


Answer: C

Environmental & Atmospheric Sciences

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On this map of South America and adjacent areas, which site would have earthquakes along a subduction zone?



A) 1, the oceanic trench
B) 2, below the magmatic belt
C) 3, along a passive margin
D) 4, in the middle of the Atlantic Ocean
E) Both 1 and 2.

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In Africa, about 12 per cent of the people practice Animism, another name for traditional ethnic religions

Indicate whether the statement is true or false.

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The most mobile dunes are:a

longitudinal. b. transverse. c. barchan. d. parabolic. e. none of the above

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A 10-N falling object encounters 10 N of air resistance. The net force on the object is

A) 0 N. B) 4 N. C) 6 N. D) 10 N. E) none of the above

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