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# The peaks of a mountain range, acting like rocks in a streambed, produ

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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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17 Aug 2012, 15:27
The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them: the resulting flow pattern, with crests and toughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves."

A) crests and toughs that remain stationary although the air that forms them is moving rapidly, are
B) crests and toughs that remain stationary although they are formed by rapidly moving air, are
C)crests and toughs that remain stationary although the air that forms them is moving rapidly, is
the "äir"is known as standing waves-correct
D)stationary crests and toughs although the air that forms them is moving rapidly, are
E)stationary crests and toughs although they are formed by rapidly moving air, is.
crests and toughs are not known as stationary waves-incorrect
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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17 Aug 2012, 16:11
1
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IMO:C
The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them: the resulting flow pattern(Singular subject), with crests and toughs that remain stationary although the air that forms them is moving rapidly, are (plural verb for singular subject) known as "standing waves."

A) crests and toughs that remain stationary although the air that forms them is moving rapidly, are :wrong
B) crests and toughs that remain stationary although they are formed by rapidly moving air, are:Wrong
C)crests and toughs that remain stationary although the air that forms them is moving rapidly, is :Right (preserved the original intended meaning of the sentence)
D)stationary crests and toughs although the air that forms them is moving rapidly, areWrong
E)stationary crests and toughs although they( refer to singular subject "the resulting flow pattern") are formed by rapidly moving air, is. wrong (meaning changed completely )
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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24 Oct 2012, 17:12
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The peaks of a mountain range, acting like rocks in a
streambed, produce ripples in the air ﬂowing over
them; the resulting ﬂow pattern, with crests and
troughs that remain stationary although the air
that forms them is moving rapidly, are
known as
“standing waves.”

(A) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, are
(B) crests and troughs that remain stationary
although they are formed by rapidly moving
air, are
(C) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, is
(D) stationary crests and troughs although the air
that forms them is moving rapidly, are
(E) stationary crests and troughs although they are
formed by rapidly moving air, is

I do not know is this sentence is a 700 level or less but is tricky.

I'm going through the OG 12 before attack the new one
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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24 Oct 2012, 18:48
1
KUDOS
carcass wrote:
The peaks of a mountain range, acting like rocks in a
streambed, produce ripples in the air ﬂowing over
them; the resulting ﬂow pattern, with crests and
troughs that remain stationary although the air
that forms them is moving rapidly, are
known as
“standing waves.”

(A) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, are
(B) crests and troughs that remain stationary
although they are formed by rapidly moving
air, are
(C) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, is
(D) stationary crests and troughs although the air
that forms them is moving rapidly, are
(E) stationary crests and troughs although they are
formed by rapidly moving air, is

I do not know is this sentence is a 700 level or less but is tricky.

I'm going through the OG 12 before attack the new one

This is actually pretty straight forward. The verb after the comma is basically linked to subject 'pattern' and not crest and troughs. Once we've identified this, we know that it would be singular is not plural are. A,B D are eliminiated. Between C and E - E is wordy and passive voice.
C is clear winner.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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24 Oct 2012, 22:42
"The resulting flow pattern" is singular and hence A,B and D can be eliminated. Between C and E, will go with C for concision.

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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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25 Oct 2012, 01:43
Vips0000 wrote:
carcass wrote:
The peaks of a mountain range, acting like rocks in a
streambed, produce ripples in the air ﬂowing over
them; the resulting ﬂow pattern, with crests and
troughs that remain stationary although the air
that forms them is moving rapidly, are
known as
“standing waves.”

(A) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, are
(B) crests and troughs that remain stationary
although they are formed by rapidly moving
air, are
(C) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, is
(D) stationary crests and troughs although the air
that forms them is moving rapidly, are
(E) stationary crests and troughs although they are
formed by rapidly moving air, is

I do not know is this sentence is a 700 level or less but is tricky.

I'm going through the OG 12 before attack the new one

This is actually pretty straight forward. The verb after the comma is basically linked to subject 'pattern' and not crest and troughs. Once we've identified this, we know that it would be singular is not plural are. A,B D are eliminiated. Between C and E - E is wordy and passive voice.
C is clear winner.

I picked the correct answer too, I wanted to know the level of the question

One thing Vips: if I pick about 80 % of OG and OG review math both PS and DS and considering that verbal is more important than quant ( I 'm not aiming the oerfect score but 680 up......) do you think in your opinion that I'm in a good situation for the exam ??

Or is better to practice for instance Bunuel' questions take a cat and then reflect on this ??? I mean OG is for those that are inside the bell curve or with the 80% for sure a student will do well during the test day ???

Thanks and sorry for a little digression
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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25 Oct 2012, 02:00
carcass wrote:
The peaks of a mountain range, acting like rocks in a
streambed, produce ripples in the air ﬂowing over
them; the resulting ﬂow pattern, with crests and
troughs that remain stationary although the air
that forms them is moving rapidly, are
known as
“standing waves.”

(A) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, are
(B) crests and troughs that remain stationary
although they are formed by rapidly moving
air, are
(C) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, is
(D) stationary crests and troughs although the air
that forms them is moving rapidly, are
(E) stationary crests and troughs although they are
formed by rapidly moving air, is

I do not know is this sentence is a 700 level or less but is tricky.

I'm going through the OG 12 before attack the new one

The singular subject "the resulting ﬂow pattern" requires singular verb is and not are
hence A, B & D are eliminated.
E although changes "crests and troughs that remain stationary" to adjective "stationary crests and troughs" but changes the sentence from active to passive.

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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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02 Nov 2012, 04:11
3
KUDOS
1
This post was
BOOKMARKED
I will try to break the tie between C and E.

Although rule : The pronoun after although does not refers to the nearest noun, but to the first noun in the sentence.

The sentence with option E is:
the resulting ﬂow pattern, with stationary crests and troughs although they are formed by rapidly moving air, is known as “standing waves.”

According to the above rule, they refers to resulting ﬂow pattern and not to stationary crests and troughs.

Hence, C wins.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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02 Nov 2012, 04:58
carcass wrote:
The peaks of a mountain range, acting like rocks in a
streambed, produce ripples in the air ﬂowing over
them; the resulting ﬂow pattern, with crests and
troughs that remain stationary although the air
that forms them is moving rapidly, are
known as
“standing waves.”

(A) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, are
(B) crests and troughs that remain stationary
although they are formed by rapidly moving
air, are
(C) crests and troughs that remain stationary
although the air that forms them is moving
rapidly, is
(D) stationary crests and troughs although the air
that forms them is moving rapidly, are
(E) stationary crests and troughs although they are
formed by rapidly moving air, is

I do not know is this sentence is a 700 level or less but is tricky.

I'm going through the OG 12 before attack the new one

The subject is "The resulting flow pattern", which is singular. So, A, B and D are out. GMAT hate passive format. So the correct answer is C.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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07 Nov 2012, 03:42
The resulting flow patern - Singular - use of "is" is the right choice.

Choice C is the right answer

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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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10 Nov 2012, 04:05
I want to follow this post.

Normally, we need to understand the meaning of the SC problem to get it right.

however, in some questions, new words appear and make us, non native, unable to understand the meaning. in this case, gmat tests the purely mechanical grammartical errors. In other words, gmat tests our ability to realize sentence structures.

we do not need to understand the meaning when we read the original choice as usually. just read other choices and find mechanical grammatical errors.

I realize this problem. but in the test room, application of this strategy is hard because we are not ourself in the test room.

pls, comment.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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24 Aug 2013, 06:06
C and E are the only choices which agree in subject and verb, but not sure why E is wrong.
Rest all get eliminated as are is wrong verb here.

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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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25 Aug 2013, 02:24
I believe the the right answer is C as it has proper subject verb agreement and correct modifier.

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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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25 Aug 2013, 03:04
i know C is correct by looking for the reason why E is wong.

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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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25 Aug 2013, 03:22
"flow pattern" is singular. So verb should be "is". You are left with C and E. E sounded awkward and also as sudhir has pointed out, "they" has no clear antecedent.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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04 Sep 2013, 05:37
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Expert's post
atalwar wrote:
i know C is correct by looking for the reason why E is wong.

Thanks for posting this question. This is a very nice question that once again exemplifies the importance of understanding the meaning and noting when a choice may change the meaning of the sentence.

Lets first analyze the original sentence -

The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over them; the resulting flow pattern, with crests and troughs that remain stationary although the air that forms them is moving rapidly, are known as "standing waves".

The peaks produce ripple in air. This creates a flow pattern. This flow pattern has crests and troughs. Even though the air that forms them moves rapidly, these remain stationary. This pattern is called standing waves.

Now given this meaning, lets focus on choice C - It communicates exactly the same thing. So C is the correct answer.

Now lets look at choice E - here the use of modifier - stationary- distorts the intended meaning. Now the intended contrast is not very apparent. It is no longer clear. Per choice A and C, the contrast is very clear - crests and troughs REMAIN stationary, whereas the air that forms them moves rapidly. But in choice E - it appears as if the stationary crests and troughs are made by the rapidly moving air.

This is why choice E is not correct.

Thanks.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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20 Nov 2013, 07:06
daagh wrote:
I will not go beyond saying that C is more wholesome than E. I would not say. E is awkward or E lacks contrast. As long as the three elements are there namely, stationary on one side, rapidly moving on the other side and the contrast –marker 'although' in between, then I feel the contrast is established. The only faint reason why C was weighed in might have been because ‘the crests and troughs that remain’ is parallelly matched by ‘the air that forms’

How can we dispute an OG OA!
@daagh I am not able to get through my head on the parallel structure specified by you. To be really frank, I really think that C is sub-optimal and "air that forms them" should have been replaced by "air forming them" to enhance choice C.

But, I would surely like to give my reasons for C and would like to invite comments on my approach.
C&T = Crests and troughs

E) with stationary C&T although air is moving rapidly—Let Focus on this portion only first as this is the different portion .
[with stationary C&T] is a phrase next to although clause [although air is moving rapidly]. This Although clause expects a clause in subordination and not a phrase next to it. So E can be kicked of.
C) with C&T that remain stationary although they are formed by rapidly moving air – In this portion "with C&T" is the independent phrase and “[that …although …] is the relative clause. What I mean to say is, while deconstructing sentence, "with crest and troughs" can survive without relative clause in C.
The resulting flow pattern, with crests and troughs, is known as “standing waves”.
Relative clause is now introduced to enhance the above sentence to create exact sentence C.
The resulting flow pattern, with crests and troughs [that X], is known as “standing waves”.
where X= C&T remain stationary though air that forms them is moving rapidly
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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20 Nov 2013, 10:05
joshnsit wrote:
@daagh I am not able to get through my head on the parallel structure specified by you. To be really frank, I really think that C is sub-optimal and "air that forms them" should have been replaced by "air forming them" to enhance choice C.

Original sentence just says that the air which forms C&Ts is "rapidly moving".

This is way different from what E says: C&Ts are formed by "rapidly moving air".

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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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20 Nov 2013, 12:48
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sacmanitin wrote:
The Peaks of a mountain range, acting like rocks in a streambed,produce ripples in the air flowing over them;the resulting flow with crests and troughs that remain stationary although the air that forms them is moving rapidly,arepattern, known as "standing waves".

A. crests and troughs that remain stationary although the air that forms them is moving rapidly,are
B. crests and troughs that remain stationary although they are formed by rapidly moving air ,are
C. crests and troughs that remain stationary although the air that forms them is moving rapidly,is
D. stationary crests and troughs although the air that forms them is moving rapidly,are
E. stationary crests and troughs although they are formed by rapidly moving air ,is

friends its a OG-11 SC question , i want to understand why the option (E) is "awkward and unclear".Thanks in advance.

Good question to practice.

First split: "IS" or "ARE"?
the main subject of the second clause is "the resulting flow" that is singular ==> "IS" is correct ==> A, B, D are out immediately.

Second split: C or E?
Note: Many folks say E is wrong because of passive voice. The idea is WRONG. GMAC never says passive voice is always wrong. if you ALWAYS eliminate passive voice in real tests, you may get the question wrong.

Back to C and E.
to pick a correct answer, we need some basic grammars of using "although".
"Although" is used to convey contrast meaning between two parts of the sentence. The two MUST be parallel in meaning.
For example:
1/. I ate two green apples although they are mature. <== WRONG.
The blue part and the red part do NOT create a contrast meaning at all. The fact "I ate two green apples" and "they are mature" do not convey the intended contrast meaning.

2/. I ate two apples that are green although they are mature <== CORRECT.
The two blue parts are perfectly contrast: apples are green although they are mature.
Hence, the sentence is correct.

Compare C and E.
Option C: the resulting flow with [crests and troughs that remain stationary although the air that forms them is moving rapidly],is...............
The two blue parts are perfectly contrast and parallel in meaning. I used [....] to separate the sentence in which "although" is used correctly.

Option E: the resulting flow with stationary crests and troughs although they are formed by rapidly moving air , is.............
The red and the blue parts do NOT convey contrast. Thus, E is wrong.

Hope it helps.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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