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

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20 Mar 2008, 10:13
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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 have seen previous threads but I didn't find accurate explanation of the correct choice. I would appreciate if you can explain your answers. THNX
If you have any questions
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Re: SC - Global Thermostat [#permalink]

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20 Mar 2008, 12:16
maverick101 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).

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 have seen previous threads but I didn't find accurate explanation of the correct choice. I would appreciate if you can explain your answers. THNX

Going for E:

The structure is as follow: Although blah blah, but they also (to show contrast)

Acting right after the comma modifies solar radiation so A,B and C are out.
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Re: SC - Global Thermostat [#permalink]

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20 Mar 2008, 13:24
(A)

The sentence has the following structure: although (clause), (phrase), also (clause)
The phrase part should not have a noun / pronoun, which eliminates C, D, E.
B is wrong because acclerating is not a verb, which is needed in the second clause.
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Re: SC - Global Thermostat [#permalink]

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20 Mar 2008, 21:53
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
It seems "solar radiation" is acting as a thermostat.
B)acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating
It seems "solar radiation" is acting as a thermostat.
C)act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating
The construct of first 2 sentenses are like,
DC,IC
(Although ...... radiation),(act ...... over) > Wrong. In the IC we need a subject ... they, ice flakes etc.
Its easy to think "act" is plural verb so it must be "ice particles", but the construction is wrong.
D)they act as a global thermostat that thus keeps the Earth either from burning up or freezing over, even though it also accelerates
it ???? refers what ?
E)they act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate

Going for E.
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Re: SC - Global Thermostat [#permalink]

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20 Mar 2008, 22:06
maverick101 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).

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

A is correct. the structure is

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

read as "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)".

B is fragmented, not a complete sentence. needs IC.
C is same as B.
D. unclear.
E. also unclear.
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Re: SC - Global Thermostat [#permalink]

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20 Mar 2008, 22:12
GMATTIGER,
"acting as a global thermostat and thus keeping Earth either from burning up or freezing over" seems to modify "solar radiation".
Else, we have to make to make it resumptive saying . ice partices acting ......

When will I finish GMAT
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Re: SC - Global Thermostat [#permalink]

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20 Mar 2008, 22:20
huntgmat wrote:
GMATTIGER,
"acting as a global thermostat and thus keeping Earth either from burning up or freezing over" seems to modify "solar radiation".
Else, we have to make to make it resumptive saying . ice partices acting ......

When will I finish GMAT

"acting as a global thermostat and thus keeping Earth either from burning up or freezing over" modifies the preceding whole clause not only the last phrase.
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Re: SC - Global Thermostat [#permalink]

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20 Mar 2008, 22:47
I get what is wrong.
If we can spot a worse error in E, obviously A will be correct.

=>
Although ......., but ...... is a very odd construction. E eliminated.

Thanks Tiger and Hail Gmat
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Re: SC - Global Thermostat [#permalink]

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21 Mar 2008, 00:41
huntgmat wrote:
I get what is wrong.
If we can spot a worse error in E, obviously A will be correct.

=>
Although ......., but ...... is a very odd construction. E eliminated.

Thanks Tiger and Hail Gmat

You are right, furthermore, "to thus keep" also an error according to Manhattan
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Re: SC - Global Thermostat [#permalink]

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21 Mar 2008, 05:49
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huntgmat wrote:
I get what is wrong.
If we can spot a worse error in E, obviously A will be correct.

=>
Although ......., but ...... is a very odd construction. E eliminated.

Thanks Tiger and Hail Gmat

It depends on how the structure is made. In terms of clauses, E is fine.

1. "Although................., ..............................., but............." structure in E is fine because it is Dependent clause, Independent clause, Dependent clause structure.

for ex: Although this route is difficult to walk, it is the shortest way to reach Annapurna Base Camp but its already too late to leave.

2. "Although......................................, but............." structure in E is not correct because it has Dependent clause, Dependent clause structure.

for ex: Although this route is difficult to walk, but it is the shortest way to reach Annapurna Base Camp and its already too late to leave.

E has some other serious mistakes. It changes the meaning and also has some wrong expression such as "to thus keep".
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Re: SC - Global Thermostat [#permalink]

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21 Mar 2008, 05:54
Great Explanation Tiger +1

By change of meaning I am sure you mean using "but" conjunction we should generally introduce something -ve or opposite. Generally we are dealing with || meaning so usage of but changes the intended meaning.
Re: SC - Global Thermostat   [#permalink] 21 Mar 2008, 05:54
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