Tektites, which may have been propelled to Earth from lunar : GMAT Sentence Correction (SC)
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# Tektites, which may have been propelled to Earth from lunar

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Tektites, which may have been propelled to Earth from lunar [#permalink]

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22 Feb 2008, 00:34
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Tektites, which may have been propelled to Earth from lunar volcanoes, are much like the volcanic glass obsidian, but their chemical composition is different than any terrestrial lava; they contain far less water than obsidian does and none of its characteristic microcrystals.

(A) is different than any terrestrial lava; they contain - wrong - "different from" should be

(B) is different than any terrestrial lava’s, containing -- wrong - "different from" should be

(C) is different from that of any terrestrial lava; they contain - I have doubt about pronoun reference in this choice, see below.

(D) differs from any terrestrial lava in containing - wrong should be "that (composition) of any terrestrial lava"

(E) differs from that (composition) of any terrestrial lava’s (composition), containing - wrong

Tektites, which may have been propelled to Earth from lunar volcanoes, are much like the volcanic glass obsidian, but their chemical composition is different from that of any terrestrial lava; they (Tektites) contain far less water than obsidian does and none of its (lava) characteristic microcrystals.

Please correct me if I am wrong and kindly comment pronoun reference.
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22 Feb 2008, 03:17
Yup C is correct,

For the pronoun they usage seehttp://gmatclub.com/forum/11-t60374

regards,
Pras
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22 Feb 2008, 04:51
az780 wrote:
Tektites, which may have been propelled to Earth from lunar volcanoes, are much like the volcanic glass obsidian, but their chemical composition is different than any terrestrial lava; they contain far less water than obsidian does and none of its characteristic microcrystals.

(A) is different than any terrestrial lava; they contain - wrong - "different from" should be

(B) is different than any terrestrial lava’s, containing -- wrong - "different from" should be

(C) is different from that of any terrestrial lava; they contain - I have doubt about pronoun reference in this choice, see below.

(D) differs from any terrestrial lava in containing - wrong should be "that (composition) of any terrestrial lava"

(E) differs from that (composition) of any terrestrial lava’s (composition), containing - wrong

Tektites, which may have been propelled to Earth from lunar volcanoes, are much like the volcanic glass obsidian, but their chemical composition is different from that of any terrestrial lava; they (Tektites) contain far less water than obsidian does and none of its (lava) characteristic microcrystals.

Please correct me if I am wrong and kindly comment pronoun reference.

I like C. it has the correct form "different from" and has the right referent
Re: SC (Tektites)   [#permalink] 22 Feb 2008, 04:51
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