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Positing an enormous volcanic explosion at the end of the Permian peri

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Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 11 Jun 2017, 13:05
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The Official Guide for GMAT Review 2018

Practice Question
Sentence Correction
Question No.: 763

Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been shattered by high-impact shock waves.

(A) account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been
(B) of the element iridium (originating deep within the earth), and of quartz
(C) the element iridium (originating deep within the earth), and explain the presence of quartz having been
(D) the presence of the element iridium (originating deep within the earth), and explain the presence of quartz
(E) explain the element iridium (originating deep within the earth), and the presence of quartz

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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 11 Jun 2017, 20:43
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Topic Tested: Parallelism

Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been shattered by high-impact shock waves. -- The original sentence is not parallel

A. account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been - Incorrect. Parallelism error.

B. of the element iridium (originating deep within the earth), and of quartz - Correct. would explain the presence of a buried crater, of the element iridium, and of quartz.

C. the element iridium (originating deep within the earth), and explain the presence of quartz having been - Incorrect. would explain the presence of x, y and explain the presence of z is not parallel again.

D. the presence of the element iridium (originating deep within the earth), and explain the presence of quartz - Incorrect. Parallelism error again.

E. explain the element iridium (originating deep within the earth), and the presence of quartz - Incorrect. Parallelism error.

Answer: B
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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 11 Jun 2017, 23:38
AbdurRakib wrote:
Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been shattered by high-impact shock waves.
A. account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been
B. of the element iridium (originating deep within the earth), and of quartz
C. the element iridium (originating deep within the earth), and explain the presence of quartz having been
D. the presence of the element iridium (originating deep within the earth), and explain the presence of quartz
E. explain the element iridium (originating deep within the earth), and the presence of quartz


The Official Guide for GMAT Review 2018

Practice Question
Sentence Correction
Question No.: 763


||ism ...
Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been shattered by high-impact shock waves.

lets plug in option B

Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, of the element iridium (originating deep within the earth), and of quartz shattered by high-impact shocks wave.
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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 12 Jun 2017, 01:34
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This question tests Parallelism. Parallelism that we need to check may follow either of the 3 below mentioned patterns-
Pattern 1 - Explain the presence of X, Y, & Z - Correct
Pattern 2 - Explain the presence of X, the presence of Y, & the presence of Z - Correct
Pattern 3 - Explain the presence of X, Explain the presence of Y, & Explain the presence of Z - Correct


A) Follows Pattern 2, But use of ACCOUNT FOR is unjustified. Hence Incorrect
B) Follows Pattern 1. Hence Correct
C) Follows mix of Patterns 1, 2, & 3. Hence Incorrect
D) Follows mix of Patterns 2 & 3. Hence Incorrect
E) Follows mix of Patterns 3 & 2. Hence Incorrect
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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 29 Jun 2017, 09:30
elegantm wrote:
This question tests Parallelism. Parallelism that we need to check may follow either of the 3 below mentioned patterns-
Pattern 1 - Explain the presence of X, Y, & Z - Correct
Pattern 2 - Explain the presence of X, the presence of Y, & the presence of Z - Correct
Pattern 3 - Explain the presence of X, Explain the presence of Y, & Explain the presence of Z - Correct


A) Follows Pattern 2, But use of ACCOUNT FOR is unjustified. Hence Incorrect
B) Follows Pattern 1. Hence Correct
C) Follows mix of Patterns 1, 2, & 3. Hence Incorrect
D) Follows mix of Patterns 2 & 3. Hence Incorrect
E) Follows mix of Patterns 3 & 2. Hence Incorrect


But is follows presence of X and Of Y.

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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 29 Jun 2017, 09:55
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somtsat99 wrote:
elegantm wrote:
This question tests Parallelism. Parallelism that we need to check may follow either of the 3 below mentioned patterns-
Pattern 1 - Explain the presence of X, Y, & Z - Correct
Pattern 2 - Explain the presence of X, the presence of Y, & the presence of Z - Correct
Pattern 3 - Explain the presence of X, Explain the presence of Y, & Explain the presence of Z - Correct


A) Follows Pattern 2, But use of ACCOUNT FOR is unjustified. Hence Incorrect
B) Follows Pattern 1. Hence Correct
C) Follows mix of Patterns 1, 2, & 3. Hence Incorrect
D) Follows mix of Patterns 2 & 3. Hence Incorrect
E) Follows mix of Patterns 3 & 2. Hence Incorrect


But is follows presence of X and Of Y.

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Hello somtsat99,


I am just adding my two cents here. When the elements in a parallel list are big phrases, the scope of possible parallel elements also increase by far.

Let's take a look at the sentence with the correct answer choice B:

Positing an enormous volcanic explosion at the end of the Permian period would explain the presence
    of a buried crater,
    of the element iridium (originating deep within the earth), and
    of quartz shattered by high-impact shock waves.


Since all the three elements are prepositional phrases, they are perfectly parallel.

Since of has been used in all the three elements, another possible parallel list can be what elegantm has stated in his post as Pattern 1.


Hope this helps. :-)
Thanks.
Shraddha
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Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 29 Jun 2017, 10:51
Could someone clarify how D is wrong?

Here is the sentence with D:
Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, the presence of the element iridium (originating deep within the earth), and [would] explain the presence of quartz shattered by high-impact shock waves.

Just before this post, I read:
https://gmatclub.com/forum/your-verbal- ... 46533.html
which suggests not be over fixated with true parallel structure to the hilt.
Shouldn't there be more than just parallelism error for us to eliminate choices?
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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 29 Jun 2017, 19:52
sevenplusplus wrote:
Could someone clarify how D is wrong?

Here is the sentence with D:
Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, the presence of the element iridium (originating deep within the earth), and [would] explain the presence of quartz shattered by high-impact shock waves.

Hi sevenplusplus, let's look at the sentence with D again:

Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, the presence of the element iridium (originating deep within the earth), and explain the presence of quartz shattered by high-impact shock waves.

By the intended meaning of the sentence, hopefully it's clear would explain is trying to explain three elements. In D, the repetition of the presence in the second element suggests that the way to do (what we call as) XYZ deconstruct is:

Positing an enormous volcanic explosion at the end of the Permian period would explain

i) X: the presence of a buried crater
ii) Y: the presence of the element iridium (originating deep within the earth)
iii) Z: explain the presence of quartz shattered by high-impact shock waves.

Once we have done this deconstruct, the common portion of the sentence (in this case Positing an enormous volcanic explosion at the end of the Permian period would explain) should individually make sense with X, with Y, and with Z.

In D, this common portion is not making sense with Z, because the sentence would read:

Positing an enormous volcanic explosion at the end of the Permian period would explain explain the presence of quartz shattered by high-impact shock waves.

explain explain is clearly incorrect.

p.s. Our book EducationAisle Sentence Correction Nirvana discusses this very powerful method of tackling parallelism (XYZ deconstruct) , its application and examples in significant detail. If someone is interested, PM me your email-id; I can mail the corresponding section.
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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 29 Jun 2017, 19:58
EducationAisle wrote:
sevenplusplus wrote:
Could someone clarify how D is wrong?

Here is the sentence with D:
Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, the presence of the element iridium (originating deep within the earth), and [would] explain the presence of quartz shattered by high-impact shock waves.

Hi sevenplusplus, let's look at the sentence with D again:

Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, the presence of the element iridium (originating deep within the earth), and explain the presence of quartz shattered by high-impact shock waves.

By the intended meaning of the sentence, hopefully it's clear would explain is trying to explain three elements. In D, the repetition of the presence in the second element suggests that the way to do (what we call as) XYZ deconstruct is:

Positing an enormous volcanic explosion at the end of the Permian period would explain

i) X: the presence of a buried crater
ii) Y: the presence of the element iridium (originating deep within the earth)
iii) Z: explain the presence of quartz shattered by high-impact shock waves.

Once we have done this deconstruct, the common portion of the sentence (in this case Positing an enormous volcanic explosion at the end of the Permian period would explain) should individually make sense with X, with Y, and with Z.

In D, this common portion is not making sense with Z, because the sentence would read:

Positing an enormous volcanic explosion at the end of the Permian period would explain explain the presence of quartz shattered by high-impact shock waves.

explain explain is clearly incorrect.

p.s. Our book EducationAisle Sentence Correction Nirvana discusses this very powerful method of tackling parallelism (XYZ deconstruct) , its application and examples in significant detail. If someone is interested, PM me your email-id; I can mail the corresponding section.


Thanks for the reply. How do we know that "would explain" is "out" of the XYZ deconstruct? My argument is that it could be considered part of each X, Y, Z.


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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 29 Jun 2017, 21:04
sevenplusplus wrote:
Thanks for the reply. How do we know that "would explain" is "out" of the XYZ deconstruct? My argument is that it could be considered part of each X, Y, Z.

Sure. So, let's try putting would explain within the XYZ deconstruct.

Positing an enormous volcanic explosion at the end of the Permian period

i) X: would explain the presence of a buried crater
ii) Y: would explain the presence of the element iridium (originating deep within the earth)
iii) Z: would explain explain the presence of quartz shattered by high-impact shock waves.

Again, as is evident, Z (would explain explain the presence...) is incorrect.
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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 11 Jul 2017, 08:04
Vyshak wrote:
Topic Tested: Parallelism

Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been shattered by high-impact shock waves. -- The original sentence is not parallel

A. account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been - Incorrect. Parallelism error.

B. of the element iridium (originating deep within the earth), and of quartz - Correct. would explain the presence of a buried crater, of the element iridium, and of quartz.

C. the element iridium (originating deep within the earth), and explain the presence of quartz having been - Incorrect. would explain the presence of x, y and explain the presence of z is not parallel again.

D. the presence of the element iridium (originating deep within the earth), and explain the presence of quartz - Incorrect. Parallelism error again.

E. explain the element iridium (originating deep within the earth), and the presence of quartz - Incorrect. Parallelism error.

Answer: B



Hi Vyshak ,

I have a doubt here. When do we use a comma before 'and'?
Usually its like a,b and c.
In what conditions, do we use- a,b, and c? and what's the difference?

Really appreciate if you or anyone on this forum can explain.

Regards,
ashygoyal
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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 12 Jul 2017, 11:54
Imo B
The parallelism is maintained in B
The structure of the list is X,Y and Z
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Re: Positing an enormous volcanic explosion at the end of the Permian peri [#permalink]

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New post 22 Apr 2018, 03:31
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Quote:
Positing an enormous volcanic explosion at the end of the Permian period would explain the presence of a buried crater, account for the presence of the element iridium (originating deep within the earth), and the presence of quartz having been shattered by high-impact shock waves.


Quote:
(B) of the element iridium (originating deep within the earth), and of quartz

Why do we need preposition of before two element names?

Quote:
(C) the element iridium (originating deep within the earth), and explain the presence of quartz having been

Is modifier having been correctly used to denote quartz was shattered earlier and than its presence was detected?
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Re: Positing an enormous volcanic explosion at the end of the Permian peri   [#permalink] 22 Apr 2018, 03:31
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