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08 May 2017, 06:34
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
70% (01:44) correct
30%
(01:53)
wrong
based on 444
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The Earth’s magnetic field has reversed a number of times in its history. Before the poles actually flip, the magnetic field weakens and the magnetic poles drift away from “true” north and south. On average, the magnetic north and south poles flip about once every 200,000 years. The last time the poles flipped was 780,000 years ago. Therefore, the poles are in the process of reversing.
Which of the following, if true, most strengthens the conclusion that the poles are reversing?
(A) Magnetic north has recently been moving toward closer alignment with “true” north.
(B) Sometimes the magnetic fields go for over one million years without reversing.
(C) The earth’s atmosphere has warmed about one degree Celsius over the past century.
(D) The strength of the magnetic field has declined by over ten percent since 1845, the first year it was measured.
(E) The location of the magnetic poles has remained unchanged for as long as magnetic compasses have been in use.
Which of the following, if true, most strengthens the conclusion that the poles are reversing?
(A) Magnetic north has recently been moving toward closer alignment with “true” north.
(B) Sometimes the magnetic fields go for over one million years without reversing.
(C) The earth’s atmosphere has warmed about one degree Celsius over the past century.
(D) The strength of the magnetic field has declined by over ten percent since 1845, the first year it was measured.
(E) The location of the magnetic poles has remained unchanged for as long as magnetic compasses have been in use.
09 May 2017, 23:24
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Official Explanation.
For this question, you need to strengthen the conclusion that the poles are currently in the process of reversing. Choice A actually weakens the conclusion because the magnetic pole’s shifting away from true north would be a sign of the poles shifting. Choice B also weakens the conclusion, as 780,000, rather than a million, years have passed since the last reversal. Choice E weakens the conclusion as well, because it again suggests stability in the poles. Eliminate C because the warming of the atmosphere isn’t relevant to the reversal of the poles. Choice D is the only answer choice that indicates a lessening of the strength of the magnetic field and a trend toward a reversal of the poles.
For this question, you need to strengthen the conclusion that the poles are currently in the process of reversing. Choice A actually weakens the conclusion because the magnetic pole’s shifting away from true north would be a sign of the poles shifting. Choice B also weakens the conclusion, as 780,000, rather than a million, years have passed since the last reversal. Choice E weakens the conclusion as well, because it again suggests stability in the poles. Eliminate C because the warming of the atmosphere isn’t relevant to the reversal of the poles. Choice D is the only answer choice that indicates a lessening of the strength of the magnetic field and a trend toward a reversal of the poles.
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10 Nov 2017, 20:05
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what is the source of this question?
boiled down to A and D.
A cannot be an answer b/c A literally weakens the argument. In A, there is an assumption that the magnetic poles are called North or South based on the location of the magnetic poles.
boiled down to A and D.
A cannot be an answer b/c A literally weakens the argument. In A, there is an assumption that the magnetic poles are called North or South based on the location of the magnetic poles.
The Earth's magnetic field is so important to us since it prevents raditions from the Sun. If the Earth lose its magnetic field, we would all die soon. 
Thank you for opinions. 
