GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 23 Sep 2018, 05:24

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Geologists believe that the warning signs for a major earthquake may i

Author Message
Intern
Joined: 03 Oct 2012
Posts: 28
WE: Other (Retail Banking)
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

29 Aug 2013, 01:19
4
1
Marcab wrote:
Guys I would like to ask all of you that how can "sudden fluctuations" and "tilting" be parallel?
"tilting" is a simple gerund and "fluctuations" is an action noun, and according to MGMAT SC, simple gerunds and action nouns can't be parallel.
So the sentence goes like this:
Geologists believe that the warning signs for a major earthquake may include [sudden fluctuations in( local seismic activity, tilting and other deformations of the earth's crust)], changing the measured strain across a fault zone, and variations in/of the electrical properties of underground rocks.

Regarding the preposition, MGMAT says that there is no compulsion on the prepositions to be the same.

Correct me if I am wrong.

according to Manhattan SC:
simple gerund should be parallel to simple gerund ONLY
complex gerund can be parallel to action nouns

look at the answer choice D. in this example, we have following warning signs for a major earthquake: sudden fluctuation in local seismic activities, tilting of the Earth's crust, changes in the measured strain across a fault zone, and variations in the electrical properties of underground rocks. now examine words in bold - fluctuation is an action noun (from verb fluctuate), changes is an action noun (from verb change), variations is an action noun (from verb vary) and as for tilting of, it is a complex gerund phrase, since complex gerund phrases are "noun through and through", which means that if you look inside the phrase, you can not turn it into a working verb. for example, try to place some noun inside the phrase "tilting of the earth's crust", such as "earthquake is tilting of the earth's crust" - you will see that this sentence does not make sense, cause it can not be turned into working verb (because of having Of-preposition in the phrase).

to sum it up, three action nouns (fluctuation, changes, variation) and one complex gerund (tilting of) are made parallel. so correct answer choice is D.

hope it helps.
Retired Moderator
Status: Getting strong now, I'm so strong now!!!
Affiliations: National Institute of Technology, Durgapur
Joined: 04 Jun 2013
Posts: 487
Location: India
GPA: 3.32
WE: Information Technology (Computer Software)
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

19 Sep 2013, 10:36
1
Bumping for review and further discussion*.

*New project from GMAT Club!!! Check HERE

_________________

Regards,

S

Consider +1 KUDOS if you find this post useful

MBA Section Director
Status: Back to work...
Affiliations: GMAT Club
Joined: 22 Feb 2012
Posts: 5593
Location: India
City: Pune
GMAT 1: 680 Q49 V34
GPA: 3.4
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

19 Sep 2013, 13:16
3
1
WaterFlowsUp wrote:
Bumping for review and further discussion*.
*New project from GMAT Club!!! Check HERE

goalsnr wrote:
Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changing the measured strain across a fault zone, and varying the electrical properties of underground rocks.

A. changing the measured strain across a fault zone, and varying
B. changing measurements of the strain across afault zone, and varying
C. changing the strain as measured across a faultzone, and variations of
D. changes in the measured strain across a faultzone, and variations in
E. changes in measurements of the strain across a fault zone, and variations among

D It is.

Geologists believe that the warning signs for a major earthquake may include j, k, l, and m. These j, k, l, m are the items in a list of a warning signs. Hence needs to be parallel.

The first two items are in the form of Adjectival Phrases 1) sudden fluctuations..... 2)tilting ...... of the earth's crust.
So to take care of parallelism remaining two items also need to be in the form of Adjectival phrase.

A) INCORRECT :- changing and varying are verbs, which can not parallel to phrases

B) INCORRECT :- varying is verb, which can not parallel to phrase. Also Change is in the strain and not in the measurements.

C) INCORRECT :- changing is verb, which can not parallel to phrase.

D) CORRECT :- This choice makes the remaining two signs parallel to previous signs. changes...... variations.....

E) INCORRECT :- changes are in the strain and not in the measurements.

Hope That Helps!
_________________
Current Student
Joined: 04 Oct 2013
Posts: 78
Location: Brazil
GMAT 1: 660 Q45 V35
GMAT 2: 710 Q49 V38
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

06 Jan 2014, 09:33
No, I wouldn't go that far away Marcab. "Tilting", in this case, is a noun - a noun participle to be precise.
Senior Manager
Joined: 21 Oct 2013
Posts: 426
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

05 Mar 2014, 15:27
3
Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth’s crust, changing the measured stain across a fault zone, and varying the electrical properties of underground rocks.

(A) changing the measured strain across a fault zone, and varying
(B) changing measurements of the strain across a fault zone, and varying
(C) changing the strain as measured across a fault zone, and variations of
(D) changes in the measured strain across a fault zone, and variations in
(E) changes in measurements of the strain across a fault zone, and variations among
Intern
Joined: 04 Jan 2012
Posts: 29
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

05 Mar 2014, 16:44
I fell for parallelism on this. Ignored D and E right away. Shouldnt have done that. I clicked A and only after that I even read "D". Arrrrrrr
Director
Status: Verbal Forum Moderator
Joined: 17 Apr 2013
Posts: 514
Location: India
GMAT 1: 710 Q50 V36
GMAT 2: 750 Q51 V41
GMAT 3: 790 Q51 V49
GPA: 3.3
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

22 Jun 2014, 22:54
This is OG Verbal 2nd edition SC Q#77

Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth’s crust, changing the measured stain across a fault zone, and varying the electrical properties of underground rocks.

The parallel list is:

1. sudden fluctuations in local seismic activity
2. tilting and other deformations of the Earth’s crust
3. changing the measured stain across a fault zone
4. varying the electrical properties of underground rocks

Changing and varying are in verb+ing form if we change it to changes… variations.
N.B titling is a Noun here.
_________________

Like my post Send me a Kudos It is a Good manner.
My Debrief: http://gmatclub.com/forum/how-to-score-750-and-750-i-moved-from-710-to-189016.html

Director
Joined: 10 Mar 2013
Posts: 547
Location: Germany
Concentration: Finance, Entrepreneurship
GMAT 1: 580 Q46 V24
GPA: 3.88
WE: Information Technology (Consulting)
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

19 Jan 2015, 14:39
1
(A) changing the measured strain across a fault zone, and varying
(B) changing measurements of the strain across a fault zone, and varying
(C) changing the strain as measured across a fault zone, and variations of
(D) changes in the measured strain across a fault zone, and variations in
(E) changes in measurements of the strain across a fault zone, and variations among

A,B,C are out --> Only comlex Gerunds can be parallel to the action noun as tilting OF THE EARTH's.. (and it is a complex gerund because it is parallel to deromations--- tilting ...AND deformations)
(E) is out for 2 reasons: 1) Dont change the original sentence, unless it's meaning isn't nonsensical. changes in measurements is wrong - changes in strain. 2) Variations among means we that are talking about different properties, but we are talking about different outputs of the same properties for different Rocks
So, we are left with D.
_________________

When you’re up, your friends know who you are. When you’re down, you know who your friends are.

800Score ONLY QUANT CAT1 51, CAT2 50, CAT3 50
GMAT PREP 670
MGMAT CAT 630
KAPLAN CAT 660

Current Student
Joined: 19 Mar 2012
Posts: 5001
Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Non-Profit and Government)
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

24 Apr 2015, 08:27
1
1
Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changing the measured strain across a fault zone, and varying the electrical properties of underground rocks.

A. changing the measured strain across a fault zone and varying

B. changing measurements of the strain across a fault zone, and varying

C. changing the strain as measured across a fault zone, and variations of

D. changes in the measured strain across a fault zone, and variations in

E. changes in measurements of the strain across a fault zone, and variations among
_________________
VP
Joined: 09 Jun 2010
Posts: 1036
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

08 Jul 2015, 03:58
1
it takes me 5 second to go to D and E but more than 3 minutes to think over D and E.
choose D finally

among means the changes between two properties
in means the changes in one properties and we have many property

very hard.
_________________

visit my facebook to help me.
on facebook, my name is: thang thang thang

Manager
Joined: 07 Apr 2015
Posts: 175
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

30 Aug 2015, 02:52
thangvietnam wrote:
it takes me 5 second to go to D and E but more than 3 minutes to think over D and E.
choose D finally

among means the changes between two properties
in means the changes in one properties and we have many property

very hard.

"variations in" is much better than "variations among". Thats why it was D (for me).
Current Student
Affiliations: Scrum Alliance
Joined: 09 Feb 2010
Posts: 81
Location: United States (MI)
Concentration: Strategy, General Management
GMAT 1: 600 Q48 V25
GMAT 2: 710 Q48 V38
WE: Information Technology (Retail)
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

01 Oct 2015, 20:46
The original question needs to be edited to stop the underline right before the "the electrical properties....".

Moderators please edit the original post containing the question. Thanks.
_________________

Intern
Status: GMAT...Not Again.....
Joined: 19 Oct 2015
Posts: 31
Location: India
Concentration: Strategy, Entrepreneurship
GMAT 1: 610 Q48 V27
WE: Engineering (Energy and Utilities)
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

29 Oct 2015, 07:52
thangvietnam wrote:
it takes me 5 second to go to D and E but more than 3 minutes to think over D and E.
choose D finally

among means the changes between two properties
in means the changes in one properties and we have many property

very hard.

same here, just 5 sec to eliminate ABC but stuck bw D and E
and choose E.

feel like i should get a check list for SC que and apply to all que.. is it possible?
_________________

correct if wrong, and a +1 wont hurt for like

Keep Faith in God Coz Every Question cannot be answered by Google

Manhattan Prep Instructor
Joined: 22 Mar 2011
Posts: 1302
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

30 Oct 2015, 01:07
1
1
Yes, this is a tough one. The choice between D and E requires some really fine detail work. As several people have said, "among" is wrong because, in contrast to the meaning of A-D, that would be a comparison from one rock to another. It would be odd to expect the properties of all rocks to be the same in the first place. Additionally, changes in measurement shouldn't be a sign of an earthquake. We should be looking for changes in the thing we are measuring--strain. That makes this element parallel with the other signs--fluctuations in activity, tilting of the crust, etc.

As for developing a checklist, you don't want to do it! It certainly wouldn't have helped with D vs. E. If you were writing a computer program, sure, but you won't be able to apply that checklist efficiently on the test. Here's what I recommend:

1) Start by looking at the basic core of the sentence. Skip over modifiers to see the simple subject, verb, etc. Here, that would be "Geologists believe that the signs may include fluctuations, tilting and other deformations, changing, and varying." (Notice that I've left out adjectives and prepositional phrases.) The subject-verb relationships ("Geologists believe" and "signs may include") are fine, but the second half of the sentence has parallelism problems. That gets rid of A-C right away.

2) Once you've settled any issues with the core (sometimes there are none), you can start looking at meaning, modifiers, etc., but there's no time to go down a list. What's more helpful is to train yourself to spot these issues when they show up. See a sentence that starts with "Unlike"? Expect a comparison issue. See a modifier that moves around? Look at how it affects the meaning.

3) If you get stuck, guess and move on! There is nothing wrong with guessing between the final two on a question like this, even if you are aiming for 700+. Know when you are beat and save your time for problems you are able to resolve with confidence!
_________________

Dmitry Farber | Manhattan GMAT Instructor | New York

Manhattan GMAT Discount | Manhattan GMAT Course Reviews | View Instructor Profile |
Manhattan GMAT Reviews

Intern
Joined: 12 Jun 2015
Posts: 47
Schools: Sloan '19
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

19 Jan 2016, 08:16
goalsnr wrote:
Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changing the measured strain across a fault zone, and varying the electrical properties of underground rocks.

A. changing the measured strain across a fault zone, and varying

B. changing measurements of the strain across afault zone, and varying

C. changing the strain as measured across a faultzone, and variations of

D. changes in the measured strain across a faultzone, and variations in

E. changes in measurements of the strain across a fault zone, and variations among

Please explain the parallelism in the sentence- use of "changing" in option C and "changes" in D.
How it is working as a verb in C and as a noun in D?
Jamboree GMAT Instructor
Joined: 09 Jan 2016
Posts: 28
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

24 Jan 2016, 03:22
1
gmatlbs wrote:
goalsnr wrote:
Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth's crust, changing the measured strain across a fault zone, and varying the electrical properties of underground rocks.

A. changing the measured strain across a fault zone, and varying

B. changing measurements of the strain across afault zone, and varying

C. changing the strain as measured across a faultzone, and variations of

D. changes in the measured strain across a faultzone, and variations in

E. changes in measurements of the strain across a fault zone, and variations among

Please explain the parallelism in the sentence- use of "changing" in option C and "changes" in D.
How it is working as a verb in C and as a noun in D?

Per the meaning of the sentence - The warning signs for a major earthquake include 4 things - a,b,c,& d. In this case - a,b,c,&d need to be parallel.

a - Sudden fluctuations in ..
b - tilting and other deformations of
c - (need to keep the consistency of writing) changes in the measured strain
d - variations in

This kind of string parallelism is correct in option D.

In addition, Changing is not a verb . (Any wording is not a verb unless preceded by is,am, are etc)
Changes in - noun preposition structure - parrallel with other similar structure in the string.

Hope this helps
_________________

Jamboree GMAT Instructor

Rohit Ghosh
Jamboree Education Pvt. Ltd.
Jamboree Course Reviews | Try 2 of our classroom classes for free before you have to pay

VP
Joined: 03 Apr 2007
Posts: 1219
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

24 Jan 2016, 03:22
This topic have been merged with: http://gmatclub.com/forum/topic-168405.html
Director
Joined: 04 Jun 2016
Posts: 583
GMAT 1: 750 Q49 V43
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

24 Jun 2016, 23:38
mbafall2011 wrote:
326. Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth’s crust, changing the measured stain across a fault zone, and varying the electrical properties of underground rocks.

(A) changing the measured strain across a fault zone, and varying
Here the fluctuations and changes are two independent signs and are equally important. Changes is not a sub warning sign. Hence it has to be changes.
(B) changing measurements of the strain across a fault zone, and varying -Not parallel
(C) changing the strain as measured across a fault zone, and variations of-this is verbose compared to A, also changing
(D) changes in the measured strain across a fault zone, and variations in -
(E) changes in measurements of the strain across a fault zone, and variations among - This is also verbose compared to D.

Geologists believe that the warning signs for a major earthquake may include P,Q,R, and S. (the comma after R is called an oxford comma)
P=sudden fluctuations in local seismic activity
Q=tilting and other deformations of the Earth’s crust
R=changes in the measured stain across a fault zone
S=variation in the electrical properties of underground rocks

OPTION A,B,C are incorrect because they lack parallelism.

OPTION D and E are correctly treating Reason P,Q, R and S as various independent reasons

OPTION E is incorrect because of "variation among" which is a wrong idiom.

Correct Idions for vary/variation are
vary between (someone and someone else)
In choosing a bridge partner, Sam varied between Tom and Wally.

vary between (something and something else)
The daytime temperatures vary between 80 and 90 degrees. She varies between angry and happy.

vary from (something to something)
Indian Summer varies from balmy warm to burning hot.

vary with (something)
The rainfall in Sahara desert varies with the season.

vary up
The University varied up its subjects with a new kind of practical and modern courses.
_________________

Posting an answer without an explanation is "GOD COMPLEX". The world doesn't need any more gods. Please explain you answers properly.
FINAL GOODBYE :- 17th SEPTEMBER 2016. .. 16 March 2017 - I am back but for all purposes please consider me semi-retired.

Senior Manager
Joined: 24 Jun 2016
Posts: 258
GMAT 1: 770 Q60 V60
GPA: 4
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

25 Jun 2016, 09:18
The first 3 answer choices say "changing", an error rendering them all wrong. Answer choice D is correct because it fixes the issue. Checking answer choice E, one can see that it changes the meaning of the sentence. D is definitely the correct answer choice.
_________________

Offering top quality online and offline GMAT tutoring in SoCal and worldwide.

\$80/hour as of May 2018.

HanoiGMATTutor@gmail.com

Current Student
Joined: 20 Sep 2014
Posts: 8
Location: India
Concentration: Finance, Operations
GMAT 1: 740 Q51 V39
GPA: 3.6
WE: Operations (Consumer Products)
Re: Geologists believe that the warning signs for a major earthquake may i  [#permalink]

### Show Tags

08 Sep 2016, 07:29
Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth’s crust, changing the measured stain across a fault zone, and varying the electrical properties of underground rocks.
(A) changing the measured strain across a fault zone, and varying
(B) changing measurements of the strain across a fault zone, and varying
(C) changing the strain as measured across a fault zone, and variations of
(D) changes in the measured strain across a fault zone, and variations in
(E) changes in measurements of the strain across a fault zone, and variations among

q1.Look at the "," after tilting. Does that mean anything? I mean is "A, B and C" different from "A, B, and C".

q2. The parallel structure can be interpreted in 2 ways. First, 3 signs are listed: 1. sudden fluctuations in local seismic activity; 2. tilting 3. other deformations of the Earth's crust. And then 2 things that these signs cause.
Other way of looking at the parallel structure is 4 signs are:
1. sudden fluctuations in local seismic activity
2. tilting and other deformations
3. changes in the measured strain across a fault zone and
4. variations in the electrical properties of underground rocks.

This is the correct one acc to the answer (D). I dont why this is better than the first one.

I have faced similar problems in other questions i.e. how to interpret the logical parallel structure when it can be done in 2 ways. Can you elaborate on this and the meaning of the ",". Would be really helpful!
Re: Geologists believe that the warning signs for a major earthquake may i &nbs [#permalink] 08 Sep 2016, 07:29

Go to page   Previous    1   2   3    Next  [ 58 posts ]

Display posts from previous: Sort by

# Geologists believe that the warning signs for a major earthquake may i

## Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.