The ozone layer is in that portion of the atmosphere known as the ________
A) troposphere
B) mesosphere
C) stratosphere
D) heterosphere
E) ionosphere
Answer: C
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Today the ethnicity of Asian Americans ________.
A. has not changed proportionately since 1960 B. has become increasingly heterogeneous C. is significantly Chinese D. is homogeneous
Photochemical smog is produced
A) when conditions for acid rain are at their peak. B) when secondary pollutants are present. C) only in industrial areas. D) when sunlight transforms certain gasses and aerosols.
The settling of the soil as water is removed from aquifers causes __________, which causes the surface to lower.
Which statement does not describe an advantage of using conventional crude oil as an energy source?
A. high net energy yield B. efficient distribution system C. environmental costs included in market price D. ample supply for several decades E. low land disruption