Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 27 May 2017, 14:30

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Professor Robinson: A large meteorite impact crater in a

Author Message
TAGS:

### Hide Tags

SVP
Joined: 16 Jul 2009
Posts: 1537
Schools: CBS
WE 1: 4 years (Consulting)
Followers: 44

Kudos [?]: 1200 [0], given: 2

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

### Show Tags

20 Jul 2010, 14:37
2
This post was
BOOKMARKED
00:00

Difficulty:

95% (hard)

Question Stats:

42% (03:12) correct 58% (02:16) wrong based on 91 sessions

### HideShow timer Statistics

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

_________________

The sky is the limit
800 is the limit

GMAT Club Premium Membership - big benefits and savings

If you have any questions
New!
Senior Manager
Joined: 12 Apr 2010
Posts: 446
Followers: 11

Kudos [?]: 104 [0], given: 157

### Show Tags

20 Jul 2010, 15:05
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.

_________________

Manager
Joined: 16 Jun 2010
Posts: 170
Followers: 3

Kudos [?]: 46 [0], given: 1

### Show Tags

21 Jul 2010, 02:39
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
_________________

R E S P E C T

Finally KISSedGMAT 700 times 450 to 700 An exprience

SVP
Joined: 17 Feb 2010
Posts: 1511
Followers: 19

Kudos [?]: 630 [0], given: 6

### Show Tags

24 Jul 2010, 15:28
I chose A too (nervously though)
Manager
Joined: 08 Jan 2010
Posts: 187
Followers: 1

Kudos [?]: 3 [0], given: 13

### Show Tags

27 Jul 2010, 23:03
Chose D .........but frankly didn't understand the options and their inference ....................

A......I just don't understand why ?
Senior Manager
Joined: 14 Jun 2010
Posts: 315
Followers: 2

Kudos [?]: 24 [0], given: 7

### Show Tags

09 Aug 2010, 09:34
by POE i went for A....was very doubtful though!
Manager
Joined: 03 May 2015
Posts: 114
Followers: 0

Kudos [?]: 13 [0], given: 48

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

### Show Tags

29 Sep 2015, 18:25
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..

Re: Professor Robinson: A large meteorite impact crater in a   [#permalink] 29 Sep 2015, 18:25
Similar topics Replies Last post
Similar
Topics:
1 Impact craters caused by meteorites smashing 2 24 Apr 2017, 02:11
15 Impact craters caused by meteorites smashing into earth 7 31 Aug 2016, 08:10
5 A detailed lab analysis of a meteorite recently discovered 17 01 Nov 2015, 03:36
Meteorite explosions in the Earth s atmosphere as large as 0 24 Mar 2012, 14:10
Professor Chan: The literature department s undergraduate 5 24 Dec 2016, 19:54
Display posts from previous: Sort by