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

Environmental & Atmospheric Sciences

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A) east. B) north. C) south. D) west. E) center.

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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

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a. True b. False

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Why do the natural reactions involving ozone not lead to depletion of the ozone layer?

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