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
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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.
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
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.
The most mobile dunes are:a
longitudinal. b. transverse. c. barchan. d. parabolic. e. none of the above