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22 Jul 2021, 21:00
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Question 1
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
53% (02:13) correct
47%
(02:20) wrong
based on 647
sessions
History
Date
Time
Result
Not Attempted Yet
Question 2
E
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:
65% (01:10) correct 35%
(01:21) wrong
based on 595
sessions
History
Date
Time
Result
Not Attempted Yet
Question 3
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
78% (00:42) correct 22%
(01:12) wrong
based on 572
sessions
History
Date
Time
Result
Not Attempted Yet
Question 4
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
91% (00:37) correct 9%
(01:00) wrong
based on 568
sessions
History
Date
Time
Result
Not Attempted Yet
Since the 1950s, the hypothesis of continental drift (originally proposed by the meteorologist Alfred Wegener in 1915) has been refined into the theory of "plate tectonics," first elaborated by Canadian geologist J. Tuzo Wilson. This theory holds that the lithosphere (the rigid outer layer of the earth) consists of about seven major and numerous minor plates in which the continents are embedded. These plates move over an underlayer of semiplastic rock, the asthenosphere. This constant shifting of plates results in faulting and the uplifting of the earth's crust into folded mountain chains. The precise cause of plate movement is unknown, though it is thought to be related to convective heat currents in the upper portion of the earth's mantle.
Plate tectonics, while more widely credited than its more rudimentary forerunner , has yet to achieve universal acceptance. Although the positions of earthquake lines and mountain chains support the theory, V.V. Beloussov in the Soviet Union and Sir Harold Jeffreys in Britain are just two of the many scientists who have raised serious objections to it. As yet, however, no competing hypothesis has shown enough explanatory power to seriously challenge it.
Plate tectonics, while more widely credited than its more rudimentary forerunner , has yet to achieve universal acceptance. Although the positions of earthquake lines and mountain chains support the theory, V.V. Beloussov in the Soviet Union and Sir Harold Jeffreys in Britain are just two of the many scientists who have raised serious objections to it. As yet, however, no competing hypothesis has shown enough explanatory power to seriously challenge it.
1. The author would most probably describe the theory of plate tectonics as:
A. a proven geological fact
B. a hypothesis that fails to explain relevant data
C. a useful theory supported by strong evidence
D. a fruitful, though inexact, hypothesis
E. a scientific conjecture by an imaginative layman
A. a proven geological fact
B. a hypothesis that fails to explain relevant data
C. a useful theory supported by strong evidence
D. a fruitful, though inexact, hypothesis
E. a scientific conjecture by an imaginative layman
2. Which of the following statements is (are) consistent with the theory of plate tectonics, as described in the passage?
I. The continents rest on a rigid layer called the asthenosphere.
II. The cause of plate movement has not yet been fully explained.
III. Mountain chains may result from collisions of the moving plates of the earth's outer layer.
A. I only
B. II only
C. III only
D. I and II only
E. II and III only
I. The continents rest on a rigid layer called the asthenosphere.
II. The cause of plate movement has not yet been fully explained.
III. Mountain chains may result from collisions of the moving plates of the earth's outer layer.
A. I only
B. II only
C. III only
D. I and II only
E. II and III only
3. The "more rudimentary forerunner" of plate tectonics mentioned in the second paragraph is the theory
A. originally propounded by J. Tuzo Wilson
B. supported by Beloussov and Jeffreys
C. of heat flow in the upper mantle
D. of mountain chain formation
E. proposed by Alfred Wegener
A. originally propounded by J. Tuzo Wilson
B. supported by Beloussov and Jeffreys
C. of heat flow in the upper mantle
D. of mountain chain formation
E. proposed by Alfred Wegener
4. The author's primary purpose is to:
A. debunk the theory of plate tectonics
B. advocate the theory of continental drift over that of plate tectonics
C. explain in detail the challenges to the theory of plate tectonics
D. offer new evidence that explains the precise cause of plate movement
E. describe the theory of plate tectonics and its acceptance in the scientific community
A. debunk the theory of plate tectonics
B. advocate the theory of continental drift over that of plate tectonics
C. explain in detail the challenges to the theory of plate tectonics
D. offer new evidence that explains the precise cause of plate movement
E. describe the theory of plate tectonics and its acceptance in the scientific community
NawalDwivedi
GMAT 2: 660 Q49 V31
Posts: 48
23 Jul 2021, 02:52
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1-C by POE. Though I am not confident about it because the language is too strong, but I cannot find any other promising option.
2-E (The info in this option cannot be true, as the first para states that the plates are rigid over which continents rest and asthenosphere is a semi plastic layer. Clearly E cannot be true.)
3-E (First line of P1 mentions that Plate tectonics(PT) is a refined form continental drift theory(CDT), hence PT's rudimentary forerunner would be CDT, which was proposed by Alfred Wegener.
4-E (P1 describes the concept of plate tectonics and the P2 describes about its acceptance in the scientific community)
Waiting for an expert's reply.
2-E (The info in this option cannot be true, as the first para states that the plates are rigid over which continents rest and asthenosphere is a semi plastic layer. Clearly E cannot be true.)
3-E (First line of P1 mentions that Plate tectonics(PT) is a refined form continental drift theory(CDT), hence PT's rudimentary forerunner would be CDT, which was proposed by Alfred Wegener.
4-E (P1 describes the concept of plate tectonics and the P2 describes about its acceptance in the scientific community)
Waiting for an expert's reply.
13 Nov 2021, 08:45
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Official Explanation
1. The author would most probably describe the theory of plate tectonics as:
Analyze the Question Stem:
The words "would probably describe"signal that this is an Inference question.
Research the Relevant Text:
The question stem does not offer any clues to narrow down the possible inferences, so no research is possible at this point.
Make a Prediction:
With a broad Inference question, making a prediction is virtually impossible. Proceed to evaluate each answer choice.
Evaluate the Answer Choices:
(A) is incorrect, as the passage deals with theories which are not universally accepted, not facts. The author herself does not take an absolute stance in the passage; she merely reports on the theories, some evidence, and the fact that there are two sides.
(B) is incorrect, as paragraph two states that "the positions of earthquake lines and mountain chains support the theory."
(C) is supported by the passage, and is correct. The passage makes clear that plate tectonics effectively explains a number of geological facts, specifically the positions of earthquake lines and mountain chains.
(D) is incorrect because exactitude is never raised as an issue in the passage.
(E) is incorrect since the passage attributes the development of the theory to scientists, not laymen.
Answer: C
TAKEAWAY: Do not use valuable time trying to make a prediction for broad, open-ended Inference questions.
Analyze the Question Stem:
The words "would probably describe"signal that this is an Inference question.
Research the Relevant Text:
The question stem does not offer any clues to narrow down the possible inferences, so no research is possible at this point.
Make a Prediction:
With a broad Inference question, making a prediction is virtually impossible. Proceed to evaluate each answer choice.
Evaluate the Answer Choices:
(A) is incorrect, as the passage deals with theories which are not universally accepted, not facts. The author herself does not take an absolute stance in the passage; she merely reports on the theories, some evidence, and the fact that there are two sides.
(B) is incorrect, as paragraph two states that "the positions of earthquake lines and mountain chains support the theory."
(C) is supported by the passage, and is correct. The passage makes clear that plate tectonics effectively explains a number of geological facts, specifically the positions of earthquake lines and mountain chains.
(D) is incorrect because exactitude is never raised as an issue in the passage.
(E) is incorrect since the passage attributes the development of the theory to scientists, not laymen.
Answer: C
TAKEAWAY: Do not use valuable time trying to make a prediction for broad, open-ended Inference questions.
