The electrons flow in a wire is due to
A. a potential difference across its ends.
B. a difference in potential energy across its ends.
C. an imbalance of charges in the wire.
D. none of the above
Answer: A
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Why are all air masses labeled either "polar," "arctic" or "tropical"?
A) because heat exchanges occur only in the low and high latitudes B) because energy exchanges occur only in the high latitudes C) because heat and energy exchanges occur only in the low and high latitudes D) because air masses don't form in the middle latitudes
If Earth warmed up, and more snow fell because of more water vapor in the atmosphere, and that snow then reduced Earth's temperature, which increased snow cover, then the initial increase in snow fall would be ________ feedback, while the continued
increase in snow fall would be ________ feedback. A) negative; positive B) positive; negative C) negative; negative D) positive; positive E) both negative and positive; both negative and positive
?What type of rate is lower in more developed countries as compared to less-developed countries and why?
Fill in the blank(s) with the appropriate word(s).
Currents are more intense on the ________ side of the North Pacific and North Atlantic Oceans.
A. eastern B. southern C. western D. northern E. None of these is correct; they are not more intense on one side.