What percentage of the Sun's energy that reaches Earth's surface is absorbed in the atmosphere?
A) 6
B) 19
C) 23
D) 30
E) 47
C
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Precipitation ________
A) that is acidic would have a pH lower than pure water B) that is acidic would have a pH higher than 7 C) that measures pH = 4 is twice as acidic as precipitation that measures pH = 5 D) that is acidic has a low concentration of hydrogen ions E) has become increasingly more basic in the last 100 years, due to industrial air pollution
Saponification requires which of the following reagents?
A) an oxidizing agent B) a strong base C) a reducing agent D) a weak acid
What percentage of groundwater and surface water withdrawn in the United States is used to cool electric power plants?
A. 3% B. 9% C. 13% D. 25% E. 41%
Earthquakes at convergent plate boundaries can be
A. shallow focus B. deep focus C. intermediate focus D. all of the preceding