What type of material is thought to explain the larger size of the outer planets relative to the inner planets?
A. metals
B. rock
C. ice
D. liquid water
E. None of these is correct.
Answer: C
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When he does work on a cart in half the time, his power output is
A. twice. B. half. C. the same. D. none of the above
The difference in saturation vapor pressure between supercooled water and ice reaches a
maximum at about –12oC. This means that the ice crystal process will be most effective in producing precipitation when cloud temperatures are:a. much colder than –12oC. b. around –12oC. c. much warmer than –12oC.
Central Asia was regarded by Czarist administrators and Soviet planners as a(n):
A) source of mineral wealth B) uninhabited desert C) source of cultural unity for Russians D) peripheral, underdeveloped region
Which of these four lakes could only exist if they if they received water from precipitation or runoff from the land? 
A. 1 and 4 B. 3 and 4 C. 2 and 4 D. 2 and 3 E. 1 and 2