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aimat780
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Tektites, which may have been propelled to Earth from lunar volcanoes 04 Oct 2020, 13:00
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Hi,
So, first split would be b/w 'different from' and 'different than'. Different than is wrong, hence option A & B gone.
Now the chemical composition of 'T' is being compared to chemical composition of t-lava. Option D wrongly compares chemical comp. to lava itself, hence wrong. Option E wrongly compares chemical comp. to t-lava's chemical comp's and hence again wrong. Option C rightly sums it up without any error.

Hope it helps.

Thanks & Regards,
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Tektites, which may have been propelled to Earth from lunar volcanoes 04 Nov 2020, 12:19
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Why “is “ in option c is preferred?

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Tektites, which may have been propelled to Earth from lunar volcanoes 04 Nov 2020, 12:52
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Alokit
Why “is “ in option c is preferred?

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good question.
...but their chemical composition is different from that of any terrestrial lava; they contain......

I am guessing you thought <their> is plural, therefore plural verb <are> should be used. However, here the singular noun <chemical composition> is paired with the singular verb <is>. Therefore 'is' is used in this sentence.
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Tektites, which may have been propelled to Earth from lunar volcanoes 23 Dec 2020, 14:25
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GMATNinja

I do not get why option B is incorrect, than any terrestrial lava's conveys the same idea as that of any terrestrial lava.

Another split is verb-ing modifier, but I see no problem there also
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Tektites, which may have been propelled to Earth from lunar volcanoes 28 Dec 2020, 06:32
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dato10kokli
GMATNinja

I do not get why option B is incorrect, than any terrestrial lava's conveys the same idea as that of any terrestrial lava.

Another split is verb-ing modifier, but I see no problem there also
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Hi

In order to denote difference, the correct idiomatic expression is "X is different from Y". Option (B) says "...is different than any terrestrial lava's...", which is incorrect.

Hope this clarifies.

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Tektites, which may have been propelled to Earth from lunar volcanoes 14 Apr 2021, 12:43
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MartyTargetTestPrep
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Could u clarify please why E is wrong.
Is it because "(E) differs from that of any terrestrial lava's, containing" chemical composition is stated once with the use of "that" and then again with the possessive "terrestrial lava's" ?
Thanks in advance
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Tektites, which may have been propelled to Earth from lunar volcanoes 15 Apr 2021, 06:35
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GMATNinja

Could u clarify please why E is wrong.
Is it because "(E) differs from that of any terrestrial lava's, containing" chemical composition is stated once with the use of "that" and then again with the possessive "terrestrial lava's" ?
Thanks in advance
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Yes, the use of the possessive "lava's" is redundant, because "that of" has already been used.

Also, notice that chemical composition would not contain water. So, in saying "chemical composition differs ... containing far less water," the (E) version conveys a nonsensical meaning.
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Tektites, which may have been propelled to Earth from lunar volcanoes 18 Jun 2022, 03:52
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well I picked C and obviously C is just the best we can have, but don't we need "other"? apparenly Tektites is one of the otherworldly lava...
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Tektites, which may have been propelled to Earth from lunar volcanoes 18 Jun 2022, 05:02
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Jezza
well I picked C and obviously C is just the best we can have, but don't we need "other"? apparenly Tektites is one of the otherworldly lava...
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Exactly. We don't need "other" because tektites are not terrestrial (of the Earth). They are from the moon.
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Tektites, which may have been propelled to Earth from lunar volcanoes 18 Jun 2022, 11:05
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MartyTargetTestPrep
Jezza
well I picked C and obviously C is just the best we can have, but don't we need "other"? apparenly Tektites is one of the otherworldly lava...
Exactly. We don't need "other" because tektites are not terrestrial (of the Earth). They are from the moon.
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Hi Marty, that's exactly what I was wondering, so much thx for the clarification.

It's one of those words that keep bothering me, I sometimes remember "extra-terrestrial" as something from earth and then "terrestrial" equals "from outside of earth", yea now I know I was almost wrong again!!!
So if someone doesn't know what "terrestrial" means, that poor guy will not be able to solve this question with certainty, he/she will just have the same question that I had...

Though all other options apart from C are just hot garbage in the basic mechanic (you don't compare component of an object with another object).
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Tektites, which may have been propelled to Earth from lunar volcanoes 18 Jun 2022, 11:49
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Hi,
Can someone please explain how is the use of "they" in the correct answer not ambiguous? Can't they refer to multiple subjects here?

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Tektites, which may have been propelled to Earth from lunar volcanoes 19 Jun 2022, 05:54
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souvik19
Hi,
Can someone please explain how is the use of "they" in the correct answer not ambiguous? Can't they refer to multiple subjects here?

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Hello souvik19,

We hope this finds you well.

To answer your query, in this sentence the only plural nouns are "Tektites" and "lunar volcanoes", so grammatically "they" can only refer to one of these two nouns; however, logically, "they" can only refer to "Tektites", as the comparison in this sentence is between "Tektites" and "obsidian", and it makes no sense to say that the "lunar volcanoes" contain water.

Remember, if there is only one noun in the sentence that can logically replace a pronoun, pronoun ambiguity does not apply.

To understand the concept of "Exceptions to Pronoun Ambiguity" on GMAT, you may want to watch the following video (~2 minutes):



All the best!
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Tektites, which may have been propelled to Earth from lunar volcanoes 20 Jun 2022, 02:43
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if you could overlook the sentence from infinitive you are answer is pretty clear
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Tektites, which may have been propelled to Earth from lunar volcanoes 28 Jun 2023, 01:27
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KarishmaB ExpertsGlobal5

Could you please explain role of 'and none of its characteristic microcrystals.' in the sentence? What is it parallel to?
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Tektites, which may have been propelled to Earth from lunar volcanoes 29 Jun 2023, 02:54
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KarishmaB ExpertsGlobal5

Could you please explain role of 'and none of its characteristic microcrystals.' in the sentence? What is it parallel to?
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Take another example:

My basket is different from yours; it contains fewer apples and no oranges.

Both, apples and oranges are objects of the verb 'contains'.

This is the same as:

My basket is different from yours; it contains fewer apples and none of the oranges. (if we know the oranges we are talking about)
This is equivalent to 'not one of the oranges'
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