Free Practice Question
CR · Critical Reasoning
505-555
Conclusion
Geophysicist: Although scientists do not entirely agree on the causes of geomagnetic reversal, they do agree that the process has the potential for significant changes on the earth. A geomagnetic reversal occurs when the magnetic field of the earth adjusts in its orientation, so that the magnetic north becomes the magnetic south, and vice versa. What is more, studies indicate that the magnetic field is gradually losing its strength and that we might expect to see a reversal within the next few millennia. While this might not seem significant, the reversal of the magnetic fields would occur over a long period of time, leaving the earth potentially unprotected from the sun’s radiation.
Reviewing the information in the passage above carefully, which of the following represents the geophysicist’s primary argument?
Reviewing the information in the passage above carefully, which of the following represents the geophysicist’s primary argument?
Answer Choices
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While there will be a few effects of a geomagnetic reversal, the negative effects will be limited.
B
Geomagnetic reversals have occurred within the period of human existence on the earth, and since mankind has survived, there is no reason to fear human eradication from geomagnetic reversal.
C
Scientists do not fully understand the causes or results of geomagnetic reversal, but there is evidence that the process should not be ignored.
D
Given the severe possibilities that may arise from a geomagnetic reversal, governments should begin funding studies of this process.
E
The current placement of magnetic poles on the earth has little effect on the natural functions of the earth.
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Difficulty
505-555
Type
CR