Rock samples taken from the remains of an asteroid about : GMAT Sentence Correction (SC)
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# Rock samples taken from the remains of an asteroid about

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VP
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18 Jul 2006, 19:18
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Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

A. has been dated to be 3.47 billion years old and thus is
B. has been dated at 3.47 billion years old and thus
C. have been dated to be 3.47billion years old and thus are
D. have been dated as being 3.47 billion years old and thus
E. have been dated at 3.47billion years old and thus are

no OA.
If you have any questions
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18 Jul 2006, 19:28
A and B can be ruled out becaue of 'has been', does not go wth samples.
C loses out because of 'dated to be'. Of the rest D looks like the more likely one to me.
I will go with D.

MA wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

A. has been dated to be 3.47 billion years old and thus is
B. has been dated at 3.47 billion years old and thus
C. have been dated to be 3.47billion years old and thus are
D. have been dated as being 3.47 billion years old and thus
E. have been dated at 3.47billion years old and thus are

no OA.
VP
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18 Jul 2006, 20:05
Picking C.
'rock samples' .................'have been'.
'thus are'...........'evidence of'
Also in D, 'thus' should be followed by 'are' to make sense.
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18 Jul 2006, 20:09
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I go with E.

A and B are out because of "has" ("Rock samples" is plural).

IMO, "dated at" is the correct idiom.
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18 Jul 2006, 20:11
Either C or E. Could someone explain the difference between "dated to be" and "dated at"?
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18 Jul 2006, 21:09
I am going for E here

C says "samples dated to be..." you can't be dated TO BE x years old... IMO it is redundant, because DATED already implicates that you ARE x years old

D uses "being"... and misses "are" in the end

E

Last edited by u2lover on 18 Jul 2006, 21:20, edited 1 time in total.
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18 Jul 2006, 21:11
Will go with E.

Only C and E are the valid choices. But IMO dated at is idiomatic.
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18 Jul 2006, 21:17
ps_dahiya wrote:
I go with E.

A and B are out because of "has" ("Rock samples" is plural).

IMO, "dated at" is the correct idiom.

I was not sure of idiom 'dated at' and went for C over E. .
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18 Jul 2006, 21:20
there is no idiom "dated at", but "dated to be" is redundant... see my expln earlier
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18 Jul 2006, 21:28
u2lover wrote:
I am going for E here

C says "samples dated to be..." you can't be dated TO BE x years old... IMO it is redundant, because DATED already implicates that you ARE x years old

D uses "being"... and misses "are" in the end

E

That does make sense. Thanks u2Lover.
So ,is it ok to say......fossils are dated to 4 millions years ago.
I foung this usage very common on googling.
I will try and find more about it if possible .
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18 Jul 2006, 21:29
IMO C.

correct idiom : dated to be + certain period of time, dated at + specific time.??
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18 Jul 2006, 21:33
buzzgaurav wrote:
u2lover wrote:
I am going for E here

C says "samples dated to be..." you can't be dated TO BE x years old... IMO it is redundant, because DATED already implicates that you ARE x years old

D uses "being"... and misses "are" in the end

E

That does make sense. Thanks u2Lover.
So ,is it ok to say......fossils are dated to 4 millions years ago.
I foung this usage very common on googling.
I will try and find more about it if possible .

As per my understanding both are correct:
dated to 4 millions years ago
dated at 4 millions years old
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19 Jul 2006, 01:18
MA wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

A. has been dated to be 3.47 billion years old and thus is
B. has been dated at 3.47 billion years old and thus
C. have been dated to be 3.47billion years old and thus are
D. have been dated as being 3.47 billion years old and thus
E. have been dated at 3.47billion years old and thus are

no OA.

plural subject then we need have at the beginning (samples plural) in C and D to be and as being seems awkward I will pick then E
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19 Jul 2006, 11:17
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19 Jul 2006, 12:02
the other discussion is no help I am still sticking to E as C seems redundant...

MA, no OA for this? that sucks
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19 Jul 2006, 12:14
MA wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

A. has been dated to be 3.47 billion years old and thus is
B. has been dated at 3.47 billion years old and thus
C. have been dated to be 3.47billion years old and thus are
D. have been dated as being 3.47 billion years old and thus
E. have been dated at 3.47billion years old and thus are

no OA.

C.

"dated to be" is idiomatically correct, IMO. Its usage is similar to "estimated to be".

Anyway, lets get to the idiom last.
A, B out due to SVA
D....thus does not connect well without "are"
Betwen C and E, I think C is idiomatically correct. Consider the difference between 'estimated to be' and 'estimated at'. The former is correct. I believe that similarly 'dated to be' is more correct than 'dated at'.
Re: SC: Rock   [#permalink] 19 Jul 2006, 12:14
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