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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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22 Oct 2010, 21:34
See the comparisons here,

C: crests and troughs that remain stationary but the air that forms them is moving.

Them refers to crests and troughs.

D: stationary crests and troughs but they are formed by rapidly moving air.

Second part of the sentence talks about the motion,but not the first part.

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

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22 Oct 2010, 21:53
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fairy1981 wrote:
Here you go. I have extracted this question from OG10.

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

I can't tell between C&D, why one is preferred to the other. Can anyone help out?

Things to look out for are -

1) the resulting flow pattern, ..blah blah.. IS known as ( Eliminating A,B,E)
2) B/W C and D,
C the air that forms them (crest and trough) is moving rapidly - ACTIVE Form to express an action
D they (crest and trough) are formed by rapidly moving air - PASSIVE Form to express an action.

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

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23 Oct 2010, 21:10
Thanks guys. Is this question considered above 700 category?

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

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23 Oct 2010, 22:15
IMO can not be ; if you can strike down three choices in one stroke i.e. subject –verb disagreement, then, it can not go beyond 600
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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 2010, 22:11
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fairy1981 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."

(c) with crests and troughs that remain stationary although the air that forms them, is

(d) with stationary crests and troughs although they are formed by rapidly moving air, is

Which one is the better choice? (I've written down only 2 choices because the other two do not make sense)

D-with stationary crests and troughs although they are formed by rapidly moving air, is

The bolded part is not a clause. You can not use although with the phrase.
check http://www.englishclub.com/grammar/conj ... nating.htm

In c - crests and troughs that remain stationary although the air that forms them is moving rapidly, is

both the bolded parts are clauses. Hence the use of although is justified.

Also in D.- 'rapidly moving air' changes the meaning.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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31 Oct 2010, 19:42
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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 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
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.

Why not this option:
[Reveal] Spoiler:
E

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

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31 Oct 2010, 22:13
Since the second half after the ":" talks about the flow pattern, the sentence should end with "is"

Thus, eliminate A, B and D

Between C and E, you will find the difference that the main clause preceding "although" has no verb in option E.

Thus, Select option C.

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

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31 Oct 2010, 22:40
Also E distorts the meaning of the original sentence and moreover use of 'they' is ambiguous

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

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01 Nov 2010, 00:40
A B D are out due to pluarl "are"
Between C & E ; E contains "they" shows ambiguity
C is left over
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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 2010, 00:07
Toughs is supposed to be troughs.

C. E is wrong because it distorts the original meaning.

E) stationary crests and troughs although they are formed by rapidly moving air, is.
Crest means the highest part of a hill or mountain range, which has to be stationary and doesn't need specification.
Stationary is supposed to be modifying troughs, not crests.

Some of you pointed out that 'they' is ambiguous, but I think that 'they' correctly refers to troughs.

C) crests and troughs that remain stationary although the air that forms them is moving rapidly, is
Troughs remain stationary.
'them' refers to troughs.
'is' is the correct verb form for the subject 'the resulting flow pattern.'

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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 2010, 01:02
C ... because 'they' refers to 'crests and troughs' in the Option E, which is incorrect.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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01 Jun 2011, 12:23
This is simple. Flow is singular so the answer should have is. Down to C and E. E changes the meaning. So C it is.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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11 Jul 2011, 08:35
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802. 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 he air that forms them is moving rapidly, are
(E) stationary crests and troughs although they are formed by rapidly moving air, is

Last edited by DeeptiM on 11 Jul 2011, 08:53, edited 1 time in total.

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

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11 Jul 2011, 08:42
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I like C

The resulting pattern = singular = is
Left with C and E
In E, I have a problem with 'they' - no clear antecedent
On a second look, I also feel E is in passive voice

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

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11 Jul 2011, 13:41
I will go with C too. I think E changes the meaning a bit too by moving "stationary" from "that" clause to in front of compound subject.
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Re: The peaks of a mountain range, acting like rocks in a streambed, produ [#permalink]

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11 Jul 2011, 14:02
C it is.

Simplifying sentence,

The resulting flow pattern, with (description) are known as “standing waves.”

Singular noun: pattern, hence singular verb: is,

Eliminating all options with 'are' we short them down to C and E.

(C) Crests and troughs that remain stationary although the air that forms them is moving rapidly, is >> 'although' is necessary to indicate contradictory conditions (stationary and moving) >> Correct option
(E) Stationary crests and troughs although they are formed by rapidly moving air, is >> though grammatically correct, not suitable here.

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

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11 Jul 2011, 20:37
OA is C

Why is the subject "The pattern" and not "The peaks of a mountain range"?

This might be a stupid question but need help.

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

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11 Jul 2011, 21:03
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The peaks of mountain range is subject of the main clause. 'peaks of mountain range' is plural so correctly them is used for them [The peaks of a mountain range, acting like rocks in a streambed, produce ripples in the air flowing over THEM]

However after semi-colon we have another clause, and this clause too should follow subject verb agreement of its own . remove the non-essential part of sentence to see.

'the resulting flow pattern ARE known as standing waves'.

ask yourself how many patterns are we talking about ? The answer is one. the resulting flow pattern. so it should be the The resulting flow pattern is known as standing waves.

crux of the matter- subject of each clause should agree with its verb. Main clause doesn't dictates the agreement issue of subordinate clause or other clauses of the sentence.

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

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11 Jul 2011, 23:30
Thanks for the explanation..I get the stated point.

Below is the logic I hold, pls correct me if I am wrong...

A new clause begings after ":" and
A new sentence begins after ";"

In each of the above scenario, subject of each should agree with its verb.

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

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12 Jul 2011, 02:47
DeeptiM wrote:
Thanks for the explanation..I get the stated point.

Below is the logic I hold, pls correct me if I am wrong...

A new clause begings after ":" and
A new sentence begins after ";"

In each of the above scenario, subject of each should agree with its verb.

A new sentence only begins after a period . (.)

A clause is group of words that contains both a subject and a verb. It may or may not be able to stand on it's own. A clause which can stand on it's own(as a meaningful sentence) is called independent clause. A clause which can't stand on it's own is called a dependent clause.

If a sentence contains two clauses, verbs of both clauses should agree with their subject,

semicolon (;) is used to link two independent clause.

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Re: The peaks of a mountain range, acting like rocks in a streambed, produ   [#permalink] 12 Jul 2011, 02:47

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