Find all School-related info fast with the new School-Specific MBA Forum

It is currently 16 Sep 2014, 14:06

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

No very satisfactory account of the mechanism that caused

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Manager
Manager
avatar
Joined: 08 Jul 2009
Posts: 177
Followers: 3

Kudos [?]: 22 [0], given: 13

No very satisfactory account of the mechanism that caused [#permalink] New post 31 Jul 2009, 20:12
No very satisfactory account of the mechanism that caused the formation of the ocean basins has yet been given. The traditional view supposes that the upper mantle of the earth behaves as a liquid when it is subjected to small forces for long periods and that differences in temperature under oceans and continents are sufficient to produce convection in the mantle of the earth with rising convection currents under the mid-ocean ridges and sinking currents under the continents. Theoretically, this convection would carry the continental plates along as though they were on a conveyor belt and would provide the forces needed to produce the split that occurs along the ridge. This view may be correct: it has the advantage that the currents are driven by temperature differences that themselves depend on the position of the continents. Such a back-coupling, in which the position of the moving plate has an impact on the forces that move it,could produce complicated and varying motions.
On the other hand, the theory is implausible because convection does not normally occur along lines. and it certainly does not occur along lines broken by frequent offsets or changes in direction, as the ridge is. Also it is difficult to see how the theory applies to the plate between the Mid-Atlantic Ridge and the ridge in the Indian Ocean. This plate is growing on both sides, and since there is no intermediate trench, the two ridges must be moving apart. It would be odd if the rising convection currents kept exact pace with them. An alternative theory is that the sinking part of the plate, which is denser than the hotter surrounding mantle, pulls the rest of the plate after it. Again it is difficult to see how this applies to the ridge in the South Atlantic, where neither the African nor the American plate has a sinking part.
Another possibility is that the sinking plate cools the neighboring mantle and produces convection currents that move the plates. This last theory is attractive because it gives some hope of explaining the enclosed seas, such as the Sea of Japan. These seas have a typical oceanic floor, except that the floor is overlaid by several kilometers of sediment. Their floors have probably been sinking for long periods. It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins. The enclosed seas are an important feature of the earth's surface, and seriously require explanation in because, addition to the enclosed seas that are developing at present behind island arcs, there are a number of older ones of possibly similar origin, such as the Gulf of Mexico, the Black Sea, and perhaps the North Sea.
1. According to the traditional view of the origin of the ocean basins, which of the following is sufficient to move the continental plates?
(A) Increases in sedimentation on ocean floors
(B) Spreading of ocean trenches
(C) Movement of mid-ocean ridges
(D) Sinking of ocean basins
(E) Differences in temperature under oceans and continents.

[Reveal] Spoiler: OA
E


2. It can be inferred from the passage that, of the following, the deepest sediments would be found in the
(A) Indian Ocean
(B) Black Sea
(C) Mid-Atlantic
(D) South Atlantic
(E) Pacific

[Reveal] Spoiler: OA
B


3. The author refers to a "conveyor belt " in line 13 in order to
(A) illustrate the effects of convection in the mantle.
(B) show how temperature differences depend on the positions of the continents.
(C) demonstrate the linear nature of the Mid-Atlantic Ridge.
(D) describe the complicated motions made possible by back-coupling.
(E) account for the rising currents under certain mid-ocean ridges.

[Reveal] Spoiler: OA
A


4. The author regards the traditional view of the origin of the oceans with
(A) slight apprehension
(B) absolute indifference
(C) indignant anger
(D) complete disbelief
(E) guarded skepticism

[Reveal] Spoiler: OA
E


5. According to the passage, which of the following are separated by a plate that is growing on both sides?
(A) The Pacific Ocean and the Sea of Japan
(B) The South Atlantic Ridge and the North Sea Ridge
(C) The Gulf of Mexico and the South Atlantic Ridge
(D) The Mid-Atlantic Ridge and the Indian Ocean Ridge
(E) The Black Sea and the Sea of Japan

[Reveal] Spoiler: OA
D


6. Which of the following, if it could be demonstrated, would most support the traditional view of ocean formation?
(A) Convection usually occurs along lines.
(B) The upper mantle behaves as a dense solid.
(C) Sedimentation occurs at a constant rate.
(D) Sinking plates cool the mantle.
(E) Island arcs surround enclosed seas.

[Reveal] Spoiler: OA
A


7. According to the passage, the floor of the Black Sea can best be compared to a
(A) rapidly moving conveyor belt
(B) slowly settling foundation
(C) rapidly expanding balloon
(D) violently erupting volcano
(E) slowly eroding mountain

[Reveal] Spoiler: OA
B


8. Which of the following titles would best describe the content of the passage?
(A) A Description of the Oceans of the World
(B) Several Theories of Ocean Basin Formation
(C) The Traditional View of the Oceans
(D) Convection and Ocean Currents
(E) Temperature Differences Among the Oceans of
the World

[Reveal] Spoiler: OA
B


Last edited by Bunuel on 07 Mar 2014, 03:17, edited 2 times in total.
Edited the OA for the last question.
Manager
Manager
avatar
Joined: 24 Apr 2009
Posts: 94
Followers: 2

Kudos [?]: 8 [0], given: 2

Re: Ocean Basin [#permalink] New post 04 Aug 2009, 03:31
OA for the last question is B not D..
B is the correct choice as per the first statement of the passage..
Intern
Intern
avatar
Joined: 24 Sep 2008
Posts: 20
Followers: 0

Kudos [?]: 5 [0], given: 1

Re: Ocean Basin [#permalink] New post 04 Aug 2009, 07:59
I also selected "B" as right answer but the word "Several" doesnt look good on title.
I chose this option as found it is closest to passage, but i'm still not convinced with the answer.

Looking for someone to give somemore explanation why D is incorrect.

-STL
Director
Director
avatar
Joined: 01 Aug 2008
Posts: 770
Followers: 3

Kudos [?]: 95 [0], given: 99

GMAT Tests User
Re: Ocean Basin [#permalink] New post 14 Aug 2009, 04:26
my choices are ..

1 e
2 b
3 a
4 b //wrong ..looks like E is correct for this one
5 d
6 a
7 b
8 b

overall good one ... at the beginning of the passage, I thought this is going to be tough but I just kept reading and finished with 7 corrects ...
Senior Manager
Senior Manager
User avatar
Joined: 21 Jul 2009
Posts: 266
Location: New York, NY
Followers: 1

Kudos [?]: 37 [0], given: 23

GMAT Tests User
Re: Ocean Basin [#permalink] New post 26 Aug 2009, 12:31
lalmanistl wrote:
Looking for someone to give somemore explanation why D is incorrect.

-STL


Because the topic is about how ocean basins are formed, not about Convection and Ocean Currents. Convection and Ocean Currents is only a theory on HOW basins are formed.
Intern
Intern
avatar
Joined: 01 Sep 2009
Posts: 34
Followers: 0

Kudos [?]: 2 [0], given: 4

Re: Ocean Basin [#permalink] New post 03 Sep 2009, 12:01
Why is #4 not D

He says the theory is implausible, meaning disbelief right.
Manager
Manager
avatar
Joined: 27 Jul 2010
Posts: 197
Location: Prague
Schools: University of Economics Prague
Followers: 1

Kudos [?]: 15 [0], given: 15

GMAT ToolKit User GMAT Tests User
Re: Ocean Basin [#permalink] New post 19 Jan 2011, 10:39
1E
2B
3E (incorrect) (correct-A)
4E
5D
6A
7B
8B

8,5 MIN
_________________

You want somethin', go get it. Period!

Senior Manager
Senior Manager
avatar
Joined: 19 Oct 2010
Posts: 274
Location: India
GMAT 1: 560 Q36 V31
GPA: 3
Followers: 6

Kudos [?]: 33 [0], given: 27

GMAT Tests User
Re: Ocean Basin [#permalink] New post 09 Apr 2011, 07:19
Question 7 seems slightly confusing to me since line 47 of the passage clearly states this: Their floors have probably been sinking for long periods.

This could mean that the floor is still eroding.. Correct?

Please explain whether this is plausible.
_________________

petrifiedbutstanding

Senior Manager
Senior Manager
avatar
Joined: 19 Oct 2010
Posts: 274
Location: India
GMAT 1: 560 Q36 V31
GPA: 3
Followers: 6

Kudos [?]: 33 [0], given: 27

GMAT Tests User
Re: Ocean Basin [#permalink] New post 09 Apr 2011, 07:22
cdowwe wrote:
Why is #4 not D

He says the theory is implausible, meaning disbelief right.


The reason D does not qualify is because he doesn't regard it with "complete disbelief". Evidence of this can be found from line 15 onwards, where he clearly mentions his reasons why it can be accepted.

If it were complete disbelief, there would be no mention of this.
_________________

petrifiedbutstanding

Intern
Intern
avatar
Joined: 25 Jan 2011
Posts: 9
Followers: 0

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

Re: Ocean Basin [#permalink] New post 13 Apr 2011, 07:36
1.E (line 6-8) differences in temperature under oceans and continents are sufficient to produce convection

2.B (47-51) Their floors have probably been sinking for long periods. It seems possible that a sinking current of cooled mantle material on the upper side of the plate might be the cause of such deep basins.

3.B (12-14) Theoretically, this convection would carry the continental plates along as though they were on a conveyor belt

4.E (I originally picked A...) (15,22) This view may be correct...On the other hand, the theory is implausible

5.D (26-29) Also it is difficult to see how the theory applies to the plate between the Mid-Atlantic Ridge and the ridge in the Indian Ocean. This plate is growing on both sides...

6.A (22-24) Opposite of: ...On the other hand, the theory is implausible because convection does not normally occur along lines.

7.B (47-48) Their floors have probably been sinking for long periods.

8.B (1-3 + discussion of views) No very satisfactory account of the mechanism that caused the formation of the ocean basins has yet been given.
Senior Manager
Senior Manager
avatar
Status: Do and Die!!
Joined: 15 Sep 2010
Posts: 333
Followers: 1

Kudos [?]: 66 [0], given: 193

Re: No very satisfactory account of the mechanism that caused [#permalink] New post 01 Nov 2011, 10:37
1) E
2)B
3)E -- Incorrect (didn't understand word " Convection" )
4)E
5)D
6)A
7)B
8)D-- Incorrect ( i don't know why B is right, because it was just only Traditional theory and rest of the topic talks about " Convection & Current "

Total Time: 10 Mints
Gin RC Technique
_________________

I'm the Dumbest of All !!

Expert Post
Verbal Forum Moderator
Verbal Forum Moderator
User avatar
Status: Preparing for the another shot...!
Joined: 03 Feb 2011
Posts: 1425
Location: India
Concentration: Finance, Marketing
GPA: 3.75
Followers: 127

Kudos [?]: 615 [0], given: 62

GMAT ToolKit User GMAT Tests User Premium Member
Re: No very satisfactory account of the mechanism that caused [#permalink] New post 05 Jan 2013, 20:46
Expert's post
1 KUDOS received
Moderator
Moderator
User avatar
Joined: 02 Jul 2012
Posts: 1228
Location: India
Concentration: Strategy
GMAT 1: 740 Q49 V42
GPA: 3.8
WE: Engineering (Energy and Utilities)
Followers: 66

Kudos [?]: 680 [1] , given: 116

Premium Member
Re: No very satisfactory account of the mechanism that caused [#permalink] New post 07 Mar 2014, 03:29
1
This post received
KUDOS
Bumping for review and further discussion*.

*New project from GMAT Club!!! Check HERE
_________________

Did you find this post helpful?... Please let me know through the Kudos button.

Thanks To The Almighty - My GMAT Debrief

GMAT Reading Comprehension: 7 Most Common Passage Types

Intern
Intern
avatar
Joined: 25 Feb 2014
Posts: 27
Concentration: Entrepreneurship, Social Entrepreneurship
GPA: 2.8
Followers: 0

Kudos [?]: 2 [0], given: 61

Premium Member CAT Tests
Re: No very satisfactory account of the mechanism that caused [#permalink] New post 03 Jul 2014, 02:57
I'm not able to understand why A is wrong for Q4. Can anybody please explain ?
_________________

Consider KUDOS if my post helped :)

Re: No very satisfactory account of the mechanism that caused   [#permalink] 03 Jul 2014, 02:57
    Similar topics Author Replies Last post
Similar
Topics:
1 No very satisfactory account of the mechanism that caused saurabhgoel 10 10 Jan 2012, 16:49
No very satisfactory account of the mechanism that caused RaviChandra 2 28 Oct 2009, 02:40
No very satisfactory account of the mechanism that caused goalsnr 4 10 Jul 2008, 19:02
No very satisfactory account of the mechanism that caused automan 2 31 Oct 2005, 14:25
no very satisfactory account of the mechanism that caused karun_aggarwal 2 15 Apr 2005, 22:45
Display posts from previous: Sort by

No very satisfactory account of the mechanism that caused

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.