How is it possible that the Moon might have some water ice today?
A) Ice brought by comet impacts may be frozen in craters near the Moon's poles.
B) Ice is continually supplied to the Moon by impacts, and some of this ice will therefore be found almost anywhere on the Moon at all times.
C) Some cold regions of the Moon may still have ice that originally formed from the condensation of water released by outgassing.
D) The Moon has significant amounts of water bonded in its surface rock, so some of this water is frozen as ice.
A
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A low f-number
a. allows a smaller depth of field. b. allows using a faster shutter speed. c. causes less spherical aberration. d. is not related to any of the above options.
How many "generations" of strongly interacting particles are there?
A) three B) four C) two D) six E) an infinite number
Two 100 W bulbs differ in that one is designed for the American 120 V rms and the other is designed for the European 220 V rms. Which bulb has the greater resistance, and what is that resistance?
A. American, 288
B. American, 144
C. European, 484
D. European, 242 
E. they are the same, 265 
The activation enthalpy for vacancy diffusion contains two contributions: the activation enthalpy for vacancy _____________and atom migration.
Fill in the blank(s) with the appropriate word(s).