Although the geological record contains some hints of major : GMAT Critical Reasoning (CR)
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# Although the geological record contains some hints of major

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Manager
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Although the geological record contains some hints of major [#permalink]

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14 Mar 2011, 08:31
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Question Stats:

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Although the geological record contains some hints of
major meteor impacts preceding mass extinctions, there
were many extinctions that did not follow any known
major meteor impacts. Likewise, there are many
records of major meteor impacts that do not seem to
have been followed by mass extinctions. Thus the
geological record suggests that there is no consistent
causal link between major meteor impacts and mass
extinctions.

Which one of the following assumptions enables the
argument’s conclusion to be properly inferred?

(A) If there were a consistent causal link between
major meteor impacts and mass extinctions,
then all major meteor impacts would be
followed by mass extinctions.
(B) Major meteor impacts and mass extinctions
cannot be consistently causally linked unless
many mass extinctions have followed major
meteor impacts.
(C) Of the mass extinctions that did not follow any
known major meteor impacts, few if any
followed major meteor impacts of which the
geological record contains no hints.
(D) If there is no consistent causal link between
major meteor impacts and mass extinctions,
then not all mass extinctions could have
followed major meteor impacts.
(E) There could be a consistent causal link between
major meteor impacts and mass extinctions
even if not every major meteor impact has
been followed by a mass extinction.
[Reveal] Spoiler: OA

Last edited by vjsharma25 on 14 Mar 2011, 20:00, edited 1 time in total.
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14 Mar 2011, 09:43
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My Post Invites Discussions not answers
Try to give back something to the Forum.I want your explanations, right now !

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14 Mar 2011, 13:29
I chose A.
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14 Mar 2011, 16:16
Hey vjsharma25
This is another interesting question from you. 99% of the time, "all" is exaggeration. However the opposite of 'some' is All or Never. In this case it works.

B is wrong "many" is not assumed when I diagram the logic it is 1:1 i.e. one impact : one extinction.

vjsharma25 wrote:
Although the geological record contains some hints of
major meteor impacts preceding mass extinctions, there
were many extinctions that did not follow any known
major meteor impacts. Likewise, there are many
records of major meteor impacts that do not seem to
have been followed by mass extinctions. Thus the
geological record suggests that there is no consistent
causal link between major meteor impacts and mass
extinctions.

Which one of the following assumptions enables the
argument’s conclusion to be properly inferred?

(A) If there were a consistent causal link between
major meteor impacts and mass extinctions,
then all major meteor impacts would be
followed by mass extinctions.
(B) Major meteor impacts and mass extinctions
cannot be consistently causally linked unless
many mass extinctions have followed major
meteor impacts.
(C) Of the mass extinctions that did not follow any
known major meteor impacts, few if any
followed major meteor impacts of which the
geological record contains no hints.
(D) If there is no consistent causal link between
major meteor impacts and mass extinctions,
then not all mass extinctions could have
followed major meteor impacts.
(E) There could be a consistent causal link between
major meteor impacts and mass extinctions
even if not every major meteor impact has
been followed by a mass extinction.
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14 Mar 2011, 17:57
IMO a
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15 Mar 2011, 23:08
IMO A. whats oa.
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Re: Although the geological record contains some hints of major [#permalink]

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21 Nov 2011, 02:33
Premise : Not all major meteor impacts are followed by mass extinctions.

Conclusion:There is no consistent causal link b/w major meteor impacts and mass extinctions.

The Gap: If not all major meteor impacts are followed by mass extinctions, then no consistent causal link can be drawn -> Choice A

Consider this exmaple:
Stimulus : I want to grow up to be big and strong.
Conclusion: I should eat a lot of vegetables.
Unstated link is : If I don't eat a lot of vege, I won't grow up to be big and strong. It's contrapositive is logically equivalent.
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Re: Although the geological record contains some hints of major [#permalink]

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21 Nov 2011, 11:49
why D is wrong?
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Re: Although the geological record contains some hints of major [#permalink]

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22 Nov 2011, 19:49
Tough question. I cannot choose between all of them Some look like conclusion of argument rather than assumption :<
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Re: Although the geological record contains some hints of major [#permalink]

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22 Nov 2011, 20:44
The word 'ALL' in the answer choice A does not make it a vulnerable choice??
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Re: Although the geological record contains some hints of major [#permalink]

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23 Nov 2011, 00:13
+1 for A,

all the other choices some what refer to what has already been stated in the argument.
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Re: Although the geological record contains some hints of major [#permalink]

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23 Nov 2011, 09:55
Tough one
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Re: Although the geological record contains some hints of major [#permalink]

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23 Nov 2011, 22:31
+1 for A.

A very tough Assumption question.

According to the argument,

Premise 1: In some cases, Major meteor impacts were followed by mass extinctions.
Premise 2: Many mass extinctions were not preceded by meteor impacts.
Premise 3: Many meteor impacts were NOT followed by mass extinctions.

Conclusion: Major Meteor Impacts DO NOT CAUSE mass extinctions.

Choice A bridges the gap between Premise 1 + 2 and conclusion by stating that if the relation were causal, all major meteor impacts would be followed by mass extinctions.
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Re: Although the geological record contains some hints of major [#permalink]

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26 Nov 2011, 00:28
manalq8 wrote:
why D is wrong?

Though i choose D as my answer..but this choice re-state the conclusion. here we're trying to find the assumption uderlining that conclusion. hence it's A.
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Re: Although the geological record contains some hints of major [#permalink]

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26 Nov 2011, 06:21
One of the toughest assumption questions – any Elite Clubber with a ‘consistent’ dab hand at assumption issues?
Fresh perspective?
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Re: Although the geological record contains some hints of major [#permalink]

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26 Nov 2011, 07:28
Chose A but was confused that it is too obvious. Actually A repeats the stem
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Re: Although the geological record contains some hints of major [#permalink]

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29 Nov 2011, 05:15
Guys this question is so abstruse...i mean if you get the answer in the first go, you are through otherwise, keep guessing!
Re: Although the geological record contains some hints of major   [#permalink] 29 Nov 2011, 05:15
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