Although ice particles in the upper atmosphere benefit Earth : GMAT Sentence Correction (SC)
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# Although ice particles in the upper atmosphere benefit Earth

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Director
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Although ice particles in the upper atmosphere benefit Earth [#permalink]

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05 Aug 2007, 08:35
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66. Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chloroflurocarbons (CFC's).

A) acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate
B)acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating
C)act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating
D)they act as a global thermostat that thus keeps the Earth either from burning up or freezing over, even though it also accelerates
E)they act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate

Can somebody please explain the sentence structure and why certain answer choices are wrong? Thanks.

Last edited by beckee529 on 05 Aug 2007, 10:20, edited 1 time in total.
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05 Aug 2007, 10:09
beckee529 wrote:
66. Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chloroflurocarbons (CFC's).

A) acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate
B)acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating
C)act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating
D)they act as a global thermostat that thus keeps the Earth either from burning up or freezing over, even though it also accelerates
E)they act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate

Can somebody please explain the sentence structure and why certain answer choices are wrong? Thanks.

I will pick C

benefit ...act ...keep are parallel
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05 Aug 2007, 10:42
r0m3416 wrote:
Vote for A..Whats OA

I missed this...It should be A

Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chloroflurocarbons (CFC's)

Although...they also....

C is flawed after "while also accelerating" isnt correct

Should be A
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05 Aug 2007, 11:02
So you mean if instead of "while also accelerating" ...it was something like
"they also accelerate " then C would have been the correct choice?

trivikram wrote:
r0m3416 wrote:
Vote for A..Whats OA

I missed this...It should be A

Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chloroflurocarbons (CFC's)

Although...they also....

C is flawed after "while also accelerating" isnt correct

Should be A
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05 Aug 2007, 11:20
beckee529 wrote:
66. Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chloroflurocarbons (CFC's).

A) acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate
B)acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating
C)act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating
D)they act as a global thermostat that thus keeps the Earth either from burning up or freezing over, even though it also accelerates
E)they act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate

Can somebody please explain the sentence structure and why certain answer choices are wrong? Thanks.

The OA is A. I had a question whether the omittance of "a" -> acting as global thermostat vs acting as a global thermostat has any relevance. Also, is "Although....they also" usually the proper form? In other words, is a sentence not gramatically correct if "while" follows "although"? Thanks.
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05 Aug 2007, 11:30
i chose A because it seemed like the lesser of 5 evils.

B: either / or must be parallel, so it should be either FROM burning up or FROM freezing over

C: the verb act is wrong

D: again either / or. "that thus" sounds stupid

E: "to thus" again sounds akward.

I am not 100% comfortable with the parenthetical clause 'acting as...freezing over' generally you look to the closest noun as a referent; which in this case is radiation. it is clear that they intended for ice particles to be the referent... so I think there is still a clarity issue.
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05 Aug 2007, 12:43
To me A is a perfectly sensible choice.
beckee529 wrote:
Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chloroflurocarbons (CFC's).

#1. Orange part is a dependent clause
#2.Green part is modifying the subject of the main clause - i.e. "they"
#3. You cannot have "a" before "global thermostat", since "global thermostat" is referring to "they" ("they itself is referring to "ice particles")
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05 Aug 2007, 20:16
I'll go for C. It maintains parallelism. D and E are very awkward.
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05 Aug 2007, 20:18
ioiio wrote:
I'll go for C. It maintains parallelism. D and E are very awkward.

Yeah.... after reading the explanation. A makes perfect sense. Thanks guyz.
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05 Aug 2007, 23:19
we need to use acting as a participle

Between A and B, A has the correct usage of either or
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06 Aug 2007, 01:47
The participle starting with acting modifies ice particles in the Although clause and the clause after 'they' is the main clause.
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06 Aug 2007, 01:50
A it is.
The participle starting with acting modifies ice particles in the Although clause and the clause after 'they' is the main clause.
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25 Oct 2007, 19:20

any one wanna decode further

Used POE and narrowed it to A and E
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25 Oct 2007, 19:49
beckee529 wrote:
66. Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chloroflurocarbons (CFC's).

A) acting as global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate - Correct
B)acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating
C)act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating - Weird - who is accelerating??
D)they act as a global thermostat that thus keeps the Earth either from burning up or freezing over, even though it also accelerates
E)they act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate

Can somebody please explain the sentence structure and why certain answer choices are wrong? Thanks.

Reading the above comments also see that in choice c - act as a is not correct
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25 Oct 2007, 19:59
Ozmba2006 wrote:

any one wanna decode further

Used POE and narrowed it to A and E

acting - adjective clearly highlights the clause 'reflect and absorb solar radiation' as the reason for thermostat. It is more appropriate than other options available.

'they act' doesn't clearly emphasis the reasons for being thermostat, which I think is the point the original stem is trying to establish.

So 'A' is the clear winner here.
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14 Jan 2008, 12:23
Can someone please explain why "acting" is needed and why we don't need "they". I'm still confused after reading all the explanations.

The clause between comma's can refer, imo, both to ice particles and to radiation (although it may not be logically clear it is not grammatically incorrect) and thus the use of acting does not seem unambiguous to me.

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15 Jan 2008, 02:45
Although ice particles in the upper atmosphere benefit Earth ...over, they also accelerate the destruction of ... (CFC's).

A

Rest don't match

Last edited by srp on 15 Jan 2008, 05:36, edited 1 time in total.
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11 May 2008, 16:56
A, Although ice particles ..., they also ... . while or while also or even though or but is incorrect for "although."
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Re: Although ice particles in the upper atmosphere benefit Earth [#permalink]

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30 Dec 2012, 08:52
A – Keep
B – Either X or Y is correct usage. Eliminate
C – While is a conjunction. 2nd sentence misses a subject. Eliminate
D – as B
E – “themostat to thus keep” – ungrammatical. Eliminate
Re: Although ice particles in the upper atmosphere benefit Earth   [#permalink] 30 Dec 2012, 08:52
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