Years before the advent of plate tectonics―the widely accepted theory, developed in the mid-1960's, the holds that the major features of Earth's surface are created by the horizontal motions of Earth's outer shell, or lithosphere―a similar theory was rejected by the geological community. In 1912, Alfred Wegener proposed, in a widely debated theory that came to be called continental drift, that Earth's continents were mobile. To most geologists today, Wegener's The origin of Continents and Oceans appears an impressive and prescient document, containing several of the essential presumptions underlying plate tectonics theory: the horizontal mobility of pieces of Earth's crust; the essential difference between oceanic and continental crust; and a causal connection between horizontal displacements and the formation of mountain chains. Yet despite the considerable overlap between Wegener's concepts and the later widely embraced plate tectonics theory, and despite the fact that continental drift theory presented a possible solution to the problem of the origin of mountains at a time when existing explanations were seriously in doubt, in its day Wegener's theory was rejected by the vast majority of geologists. Most geologists and many historians today believe that Wegener's theory was rejected because of its lack of an adequate mechanical basis. Stephen Jay Gould, for example, argues that continental drift theory was rejected because it did not explain how continents could move through an apparently solid oceanic floor. However, as Anthony Hallam has pointed out, many scientific phenomena, such as the ice ages, have been accepted before they could be fully explained. The most likely cause for the rejection of continental drift―a cause that has been largely ignored because we consider Wegener's theory to have been validated by the theory of plate tectonics―is the nature of the evidence that was put forward to support it. Most of Wegener's evidence consisted of homologies―similarities of patterns and forms based on direct observations of rocks in the field, supported by the use of hammers, hand lenses, and field notebooks. In contrast, the data supporting plate tectonics were impressively geophysical―instrumental determinations of the physical properties of Earth garnered through the use of seismographs, magnetometers, and computers. 1 VRC00416-04 1. The author cites Hallam on the ice ages primarily in order to (A) provide an example of a geologic phenomenon whose precise causes are not fully understood by geologists today (B) criticize the geological community for an apparent lack of consistency in its responses to new theories (C) offer evidence held to undermine a common view of why Wegener’s theory was not accepted in its day (D) give an example of a modern scientist who believes that Wegener’s theory was rejected because it failed to adequately explain the mechanical basis of continental drift (E) support Gould’s rationale for why Wegener’s theory was rejected by most geologists in the early twentieth century 2 VRC00416-03 2. The author of the passage refers to the "considerable overlap" between continental drift theory and plate tectonics theory most probably in order to (A) suggest that plate tectonics theory is derived from Wegener’s work (B) introduce a discussion comparing the elements of the two theories (C) examine the question of whether continental drift theory was innovative in its time (D) provide a reason why it might seem surprising that continental drift theory was not more widely embraced by geologists (E) cite an explanation that has been frequently offered for Wegener’s high standing among geologists today 3 VRC000416-02 3. The author of the passage suggests that the most likely explanation for the geological community’s response to continental drift theory in its day was that the theory (A) was in conflict with certain aspects of plate tectonics theory (B) failed to account for how mountains were formed (C) did not adequately explain how continents moved through the ocean floor (D) was contradicted by the geophysical data of the time (E) was based on a kind of evidence that was considered insufficiently convincing 4 VRC00416-01 4. It can be inferred from the passage that geologists today would be most likely to agree with which of the following statements about Wegener’s The Origin of Continents and Oceans ? (A) It was a worthy scientific effort that was ahead of its time. (B) It was based on evidence that was later disproved. (C) It was directly responsible for the acceptance of the theory of plate tectonics. (D) It has been disproved by continental drift theory. (E) It misrepresented how horizontal displacements cause the formation of mountain chains. 5 VRC00416-05 5. The author of the passage most likely discusses the “essential presumptions” (see highlighted text) of The Origin of Continents and Oceans in order to (A) indicate features of Wegener's theory that caused it to be doubted in its day (B) show why Wegener's theory is now regarded as prescient (C) indicate differences between plate tectonics and the theory of continental drift (D) cite features of the theory of continental drift for which no evidence was available in Wegener’s day (E) point out aspects of Wegener's theory that were accepted well before the advent of platetectonics 102084 102085 102086 102087 102088

bb , seems like the answer is still B? See screenshot from GMAT Official Guide 2025-2026 https://gmatclub.com/forum/download/file.php?id=84982 GMAT-Club-Forum-xvh6ju5l.png

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Years before the advent of plate tectonicsthe widely accepted theory

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05 Jun 2025, 09:04

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inesip

Hi - question 5 correct answer appear to be D instead of B, I don't understand why it is not B?

Question #5 in the latest OG, OA switched from B to D. It is a mystery.

bb, weird! Did they change the explanation as well? (I don't yet have the new OG to check myself.)

I would stand by eliminating (D) because there was in fact evidence for Wegener's theory: "Most of Wegener's evidence consisted of homologies―similarities of patterns and forms based on direct observations of rocks in the field, supported by the use of hammers, hand lenses, and field notebooks".

(B) on the other hand seems like a good fit based on this part: "To most geologists today, Wegener's The origin of Continents and Oceans appears an impressive and prescient document, containing several of the essential presumptions underlying plate tectonics theory...".

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05 Jun 2025, 10:43

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There was evidence for Wegner's theory of continental drift, only that the evidence itself was not very credible because it was based on similarities, so how can (D) be correct for question 5?

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Has there been any resolution to this? Even GMATNinja said it is B and I am having a hard time puzzling out how D could be the answer

Question #5 in the latest OG, OA switched from B to D. It is a mystery.

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Updated on: 08 Jun 2025, 15:09

Originally posted by bb on 08 Jun 2025, 15:01.
Last edited by bb on 08 Jun 2025, 15:09, edited 3 times in total.

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OLD
Years before the advent of plate tectonics―the widely accepted theory, developed in the mid-1960's, the holds that the major features of Earth's surface are created by the horizontal motions of Earth's outer shell, or lithosphere―a similar theory was rejected by the geological community. In 1912, Alfred Wegener proposed, in a widely debated theory that came to be called continental drift, that Earth's continents were mobile. To most geologists today, Wegener's The origin of Continents and Oceans appears an impressive and prescient document, containing several of the essential presumptions underlying plate tectonics theory: the horizontal mobility of pieces of Earth's crust; the essential difference between oceanic and continental crust; and a causal connection between horizontal displacements and the formation of mountain chains. Yet despite the considerable overlap between Wegener's concepts and the later widely embraced plate tectonics theory, and despite the fact that continental drift theory presented a possible solution to the problem of the origin of mountains at a time when existing explanations were seriously in doubt, in its day Wegener's theory was rejected by the vast majority of geologists.

Most geologists and many historians today believe that Wegener's theory was rejected because of its lack of an adequate mechanical basis. Stephen Jay Gould, for example, argues that continental drift theory was rejected because it did not explain how continents could move through an apparently solid oceanic floor. However, as Anthony Hallam has pointed out, many scientific phenomena, such as the ice ages, have been accepted before they could be fully explained. The most likely cause for the rejection of continental drift―a cause that has been largely ignored because we consider Wegener's theory to have been validated by the theory of plate tectonics―is the nature of the evidence that was put forward to support it. Most of Wegener's evidence consisted of homologies―similarities of patterns and forms based on direct observations of rocks in the field, supported by the use of hammers, hand lenses, and field notebooks. In contrast, the data supporting plate tectonics were impressively geophysical―instrumental determinations of the physical properties of Earth garnered through the use of seismographs, magnetometers, and computers.

NEW
Years before the advent of plate tectonics-the widely accepted theory, developed in the mid-1960s, that holds the major features of Earth's surface are created by the horizontal motions of Earth's outer shell, or lithosphere-a similar theory was rejected by the geological community. In 1912, Alfred Wegener proposed, in a widely debated theory that came to be called continental drift, that Earth's continents were mobile. To most geologists today, Wegener's The Origin of Continents and Oceans appears an impressive and prescient document, containing several of the essential presumptions underlying plate tectonics theory: the horizontal mobility of pieces of Earth's crust; the essential difference between oceanic and continental crust; and a causal connection between horizontal displacements and the formation of mountain chains.
Yet despite the considerable overlap between Wegener's concepts and the later widely embraced plate tectonics theory, and despite the fact that continental drift theory presented a possible solution to the problem of the origin of mountains at a time when existing explanations were seriously in doubt, in its day Wegener's theory was rejected by the vast majority of geologists.

Most geologists and many historians today believe Wegener's theory was rejected because of its lack of an adequate mechanical basis. A group of researchers argues continental drift theory was rejected because it did not explain how continents could move through an apparently solid oceanic floor. However, as Anthony Hallam has pointed out, many scientific phenomena, such as the ice ages, have been accepted before they could be fully explained. The most likely cause for the rejection of continental drift—a cause that has been largely ignored because we consider Wegener's theory to have been validated by the theory of plate tectonics— is the nature of the evidence that was put forward to support it. Most of Wegener's evidence consisted of homologies-similarities of patterns and forms based on direct observations of rocks in the field, supported by the use of hammers, hand lenses, and field notebooks. In contrast, the data supporting plate tectonics were impressively geophysical: instrumental determinations of the physical properties of Earth garnered through the use of seismographs and magnetometers.

I have bolded the differences.
The OA for the 5th Question The author of the passage most likely discusses the "essential presumptions" of the Origins of Continents and Oceans in order to (see lines 12-13) has been changed from D to B

B) Show why Wegener's theory os now regarded as prescient.
D) Cite features of the theory of continental drift for which no evidence was available in Wegener's day

Explanation:
The context of the phrase "essential presumptions" indicates that the author's purpose is to show how Wegener anticipated some of the important ideas in plate tectonics and was therefore prescient.

GMATNinjaTwo, let me know if you figure out this mystery!

GMATNinjaTwo

inesip

Hi - question 5 correct answer appear to be D instead of B, I don't understand why it is not B?

Question #5 in the latest OG, OA switched from B to D. It is a mystery.

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09 Jun 2025, 11:08

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Hi. Sorry about the wait.

I have looked up the passage. Page 464 of the OG 2025-2026.
The passage has been modified slightly (seems superficially) but very interesting that it has been modified the way it was. I will see if I can put them side by side and compare.

{...}

The OA for the 5th Question The author of the passage most likely discusses the "essential presumptions" of the Origins of Continents and Oceans in order to (see lines 12-13) has been changed from D to B

B) Show why Wegener's theory os now regarded as prescient.
D) Cite features of the theory of continental drift for which no evidence was available in Wegener's day

Explanation:
The context of the phrase "essential presumptions" indicates that the author's purpose is to show how Wegener anticipated some of the important ideas in plate tectonics and was therefore prescient.

GMATNinjaTwo, let me know if you figure out this mystery!

bb, that's the explanation in the latest OG? That still sounds like an explanation for why (B) is correct ("... and was therefore prescient.").

Odd that they made those minor changes to the passages, but I don't see those as having any impact on Q5.

I'm inclined to wait this one out a bit to see if they change the OA back to (B), before doing mental gymnastics to explain why (D) works.