________ of urban residents in developing countries have satisfactory sanitation services.
A. Less than 10 percent
B. Nearly all
C. Less than half
D. 70-80 percent
Answer: C
Environmental & Atmospheric Sciences
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Minerals that have strong bonds between flat crystal surfaces tend to
A. show well-developed cleavage. B. show poor cleavage. C. cleave more easily. D. have a well-developed streak.
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Hydroelectric plants using impoundments generate electricity when water is released from a ________
A) turbine B) pipe C) generator D) dam E) powerhouse
Environmental & Atmospheric Sciences
Of the alcohols with the molecular formula C4H9OH, which has the lowest boiling point?
A) 1-butanol B) sec-butyl alcohol C) tert-butyl alcohol D) isobutyl alcohol
Environmental & Atmospheric Sciences
The duration of twilight decreases with increasing latitude, especially in summer
a. True b. False
Environmental & Atmospheric Sciences