What is the size (diameter) of volcano ash?
a. < 0.2 millimeter
b. < 2 millimeter
c. 2 -5 millimeter
d. 5 ~ 10 millimeter
Answer: b. < 2 millimeter
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Which of the following molecules is most likely to show a dipole-dipole interaction?
A. CH4
B. H-C 
C-H
C. CO2
D. H2S
E. none of the above
Which nation in the region has the largest reserves of natural gas?
A) Libya
B) Saudi Arabia
C) Iran
D) Iraq
E) United Arab Emirates
The smaller the difference in temperature between the wet bulb and dry bulb on a sling psychrometer, the ________ the air is and the ________
A) drier; further the air temperature is from dew point B) drier; closer the air temperature is to dew point C) wetter; further the air temperature is from dew point D) wetter; closer the air temperature is to dew point
Economic leakage results from
A. the flow of profits from tourist facilities to foreign owners B. underground water channels C. poorly repaired irrigation ditches D. bad plumbing