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LSAT--Ice Age

Expert replies
by ssgmatter » Mon Apr 05, 2010 8:53 am
Please explain with reasons!!

According to current geological theory, the melting of
ice at the end of the Ice Age significantly reduced the
weight pressing on parts of the earth's crust. As a
result, lasting cracks in the earth's crust appeared in
some of those parts under the stress of pressure from
below. At the end of the Ice Age Sweden was racked
by severe earthquakes. Therefore, it is likely that the
melting of the ice contributed to these earthquakes.
Which one of the following, if true, most strengthens
the argument above?
(A) The earth's crust tends to crack whenever there
is a sudden change in the pressures affecting it.
(B) There are various areas in Northern Europe that
show cracks in the earth's crust.
(C) Evidence of severe earthquakes around the time
of the end of the Ice Age can be found in parts
of northern Canada.
(D) Severe earthquakes are generally caused by
cracking of the earth's crust near the
earthquake site.
(E) Asteroid impacts, which did occur at the end of
the Ice Age, generally cause severe
earthquakes.
Best-
Amit
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Source: — Critical Reasoning |

by gmatmachoman » Mon Apr 05, 2010 9:00 am
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by ssgmatter » Mon Apr 05, 2010 9:10 am
Gmatmachoman.......Please explain.........it has to be between A and D.......

OA is D :-(.....
Best-
Amit
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by kstv » Mon Apr 05, 2010 9:35 am
@ ssgmatter Really appeciate your posts . Seems you have taken trouble to choose questions from LSAT which may just pop up in GMAT. Expert Testluv though has elaborate posts on this topic.
What I find intriguing is that option B and C talks about similar phenomenon in the higher lalitudes of Northern hemisphere, but there is nothing in the Q stem to suggest that Sweden is in the same region as Northern Europe and Northern Canada though most of us know it is the case. This extra knowledge can be misleading.
D talks more specifically about earthquakes than A.
Conclusion is Therefore, it is likely that the melting of the ice contributed to these earthquakes.
Which one of the following, if true, most strengthens the argument above?
(A) The earth’s crust tends to crack whenever there
is a sudden change in the pressures affecting it. This is same as the Premise
As a result, lasting cracks in the earth’s crust appeared in
some of those parts under the stress of pressure from
below. D completes the explanation linking the cracks to earthquakes.
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by harshavardhanc » Mon Apr 05, 2010 10:48 am
ssgmatter wrote:Please explain with reasons!!

According to current geological theory, the melting of
ice at the end of the Ice Age significantly reduced the
weight pressing on parts of the earth's crust. As a
result, lasting cracks in the earth's crust appeared in
some of those parts under the stress of pressure from
below. At the end of the Ice Age Sweden was racked
by severe earthquakes. Therefore, it is likely that the
melting of the ice contributed to these earthquakes.
Which one of the following, if true, most strengthens
the argument above?
(A) The earth's crust tends to crack whenever there
is a sudden change in the pressures affecting it.
(B) There are various areas in Northern Europe that
show cracks in the earth's crust.
(C) Evidence of severe earthquakes around the time
of the end of the Ice Age can be found in parts
of northern Canada.
(D) Severe earthquakes are generally caused by
cracking of the earth's crust near the
earthquake site.
(E) Asteroid impacts, which did occur at the end of
the Ice Age, generally cause severe
earthquakes.
Premise:

melting ice at the end of Ice Age -> lasting cracks in the earth's crust

Conclusion:

melting of ice at the end of Ice Age in Sweden -> earthquakes

look at it this way :

Premise:

P->Q

Conclusion:

P->Z


For this to be true:

We somehow have to get Q->Z into our premise list.

D does that. It says : cracking of crust -> earthquakes

Now look at the argument after adding D :

melting ice at the end of Ice Age -> lasting cracks in the earth's crust
cracking of crust -> earthquakes
--------------------------------------------------------------------------------------------
melting of ice at the end of Ice Age in Sweden -> earthquakes


makes sense? ;)
Regards,
Harsha
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by ssgmatter » Tue Apr 06, 2010 7:36 am
@kstv-->Thankyou for the explanation I got the funda clear now....True the trouble with LSAT questions......Huh!!...they are really mad at times....I wonder if one of them pops up on the exam day....hehe!


@Harshavardhanc-->Good logic used....i got this one clear now....

Cheers!
Best-
Amit
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by joseph32 » Mon May 16, 2016 12:10 am
I am pretty sure that the right Answer is D
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