On this map, identify the letter that is over a midocean ridge.
A) A
B) B
C) C
D) D
E) Feature is not labeled.
B) B
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Uranium-235 releases an average of 2.5 neutrons per fission, while plutonium-239 releases an average of 2.7 neutrons per fission. Which of these elements might you therefore expect to have the smaller critical mass?
A. uranium-235 B. The number of neutrons per fission will not affect the size of critical mass. C. plutonium-239 D. The critical mass of these elements cannot be determined from only the number of neutrons per fission.
At 4ºC, the atmosphere is saturated with water vapour. If the air temperature increases to 15ºC, with no addition or removal of water vapour, what is the dew point?
A. about 2ºC B. about 15ºC C. about 8ºC D. about 4ºC
Production of which of the following is expected to decline around the middle of this century, as global deposits dwindle?
A) Carbon dioxide B) Reactive sulfur C) Phosphorus fertilizer D) Nitrogen fertilizer
Which one of the following concerning artesian wells is not true?
A) The aquifer is generally inclined, and it is saturated to an elevation above the point where the well penetrates the aquifer. B) When the well penetrates the aquifer, the water rises to the bottom of the aquitard above the aquifer. C) The well penetrates an aquifer underlain by an impermeable bed. D) The well penetrates an aquifer overlain by an aquitard.