In developing countries, most sewage is
A. handled via communal septic tanks.
B. discharged, untreated, into surface waters.
C. subjected to both primary and secondary sewage treatment.
D. subjected to primary (physical) but not chemical treatment.
Answer: B
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Why do the natural reactions involving ozone not lead to depletion of the ozone layer?
A. Ozone is too diffuse. B. Ozone continually rises from the troposphere. C. Ozone breaks into fragments that can reassemble into more ozone. D. UV radiation generates more ozone. E. both c and d
The U.S. center of population has moved steadily to the
A) east. B) north. C) south. D) west. E) center.
In order for geologists to use the Principle of Uniformitarianism to interpret the geologic record, they do not need to study modern geologic processes.
a. true b. false
Vorticity is always present in the atmosphere, even during fair weather
a. True b. False