Professor Robinson: A large meteorite impact crater in a : GMAT Critical Reasoning (CR)
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# Professor Robinson: A large meteorite impact crater in a

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Professor Robinson: A large meteorite impact crater in a [#permalink]

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20 Jul 2010, 13:37
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Professor Robinson: A large meteorite impact crater in a certain region was thought to be the clue to explaining the mass extinction of plant and animal species that occurred at the end of the Mesozoic era. However, the crystalline structure of rocks recovered at the site indicates that the impact that formed this crater was not the culprit. When molten rocks crystallize, they display the polarity of Earth’s magnetic field at that time. But the recrystallized rocks recovered at the site display normal magnetic polarity, even though Earth’s magnetic field was reversed at the time of the mass extinction.
Each of the following is an assumption on which Professor Robinson’s argument depends EXCEPT:
(A) The crater indicates an impact of more than sufficient size to have caused the mass extinction.
(B) The recovered rocks recrystallized shortly after they melted.
(C) No other event caused the rocks to melt after the impact formed the crater.
(D) The recovered rocks melted as a result of the impact that formed the crater.
(E) The mass extinction would have occurred soon after the impact that supposedly caused it.
[Reveal] Spoiler: OA

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Re: Professor Robinson [#permalink]

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20 Jul 2010, 14:05
noboru wrote:
Professor Robinson: A large meteorite impact crater in a certain region was thought to be the clue to explaining the mass extinction of plant and animal species that occurred at the end of the Mesozoic era. However, the crystalline structure of rocks recovered at the site indicates that the impact that formed this crater was not the culprit. When molten rocks crystallize, they display the polarity of Earth’s magnetic field at that time. But the recrystallized rocks recovered at the site display normal magnetic polarity, even though Earth’s magnetic field was reversed at the time of the mass extinction.
Each of the following is an assumption on which Professor Robinson’s argument depends EXCEPT:

Points mentioned
Large crater-plant and ani extinction
molten rocks crystalize-display polarity of earth.
BUT polarity found normal-expected opposite.
The only option that was not covered is whether the impact was large enough to have caused the extinction.
Didnt see EXCEPT, chose E, but E is inferred as the passsage states that the extinction was assumed to happen after impact, so its reasonable to assume that the extinction could have occured immediately

(A) The crater indicates an impact of more than sufficient size to have caused the mass extinction.
(B) The recovered rocks recrystallized shortly after they melted.
(C) No other event caused the rocks to melt after the impact formed the crater.
(D) The recovered rocks melted as a result of the impact that formed the crater.
(E) The mass extinction would have occurred soon after the impact that supposedly caused it.

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Re: Professor Robinson [#permalink]

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21 Jul 2010, 01:39
Narrowed down to A & B easily as all rest appear clear assumptions.

(A) The crater indicates an impact of more than sufficient size to have caused the mass extinction.

(B) The recovered rocks recrystallized shortly after they melted.

Eliminated A as an assumption as this is what the author is trying to prove.

And then B is more like an assumption which should be true for rocks to reflect the magnetic field from the rocks, formed during the time of the crater formation.
Thus A
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Re: Professor Robinson [#permalink]

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24 Jul 2010, 14:28
I chose A too (nervously though)
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Re: Professor Robinson [#permalink]

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27 Jul 2010, 22:03
Chose D .........but frankly didn't understand the options and their inference ....................

A......I just don't understand why ?
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Re: Professor Robinson [#permalink]

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09 Aug 2010, 08:34
by POE i went for A....was very doubtful though!
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Re: Professor Robinson: A large meteorite impact crater in a [#permalink]

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29 Sep 2015, 17:25
noboru wrote:
Professor Robinson: A large meteorite impact crater in a certain region was thought to be the clue to explaining the mass extinction of plant and animal species that occurred at the end of the Mesozoic era. However, the crystalline structure of rocks recovered at the site indicates that the impact that formed this crater was not the culprit. When molten rocks crystallize, they display the polarity of Earth’s magnetic field at that time. But the recrystallized rocks recovered at the site display normal magnetic polarity, even though Earth’s magnetic field was reversed at the time of the mass extinction.
Each of the following is an assumption on which Professor Robinson’s argument depends EXCEPT:
(A) The crater indicates an impact of more than sufficient size to have caused the mass extinction.
(B) The recovered rocks recrystallized shortly after they melted.
(C) No other event caused the rocks to melt after the impact formed the crater.
(D) The recovered rocks melted as a result of the impact that formed the crater.
(E) The mass extinction would have occurred soon after the impact that supposedly caused it.

Though not sure.. i guess the wording in A makes it wrong..

The crater indicates an impact of more than sufficient size to have caused the mass extinction

no need to be more than suff size.. can create mass extinction even if the crater is of suff size..

Experts please check in..
Re: Professor Robinson: A large meteorite impact crater in a   [#permalink] 29 Sep 2015, 17:25
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# Professor Robinson: A large meteorite impact crater in a

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