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Impact craters caused by meteorites smashing into earth

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Impact craters caused by meteorites smashing into earth [#permalink]

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Impact craters caused by meteorites smashing into earth, have been found all around the globe but they have been found in the greatest density in geologically stable regions. This relatively greater abundance of securely identified craters in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions.

The conclusion is properly drawn if which one of the following is assumed?

(A) A meteorite that strikes exactly the same spot as an earlier meteorite will obliterate all traces of the earlier impact.

(B) Rates of destructive geophysical processes within any given region vary markedly throughout geological time.

(C) The rate at which the Earth is struck by meteorites has greatly increased in geologically recent times.

(D) Actual meteorite impacts have been scattered fairly evenly over the Earth's surface in the course of Earth's geological history.

(E) The Earth's geologically stable regions have been studied more intensively by geologists than have its less stable regions.
[Reveal] Spoiler: OA

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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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New post 22 May 2015, 02:01
Why anwers is D ?
If I negate the conclusion breaks , i.e. The Earth's geologically stable regions have not studied more intensively by geologists than have its less stable regions.

Also D speaks about "impacts have been scattered fairly evenly over the Earth's surface "
but here we are talking about geologically stable areas and not earth's surface in general .

any expert kindly throw light on this.
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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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New post 05 Jul 2015, 05:51
The answer must be E..
Can anyone plz explain why D is the answer

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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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New post 05 Jul 2015, 06:35
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souvik101990 wrote:
Impact craters caused by meteorites smashing into earth, have been found all around the globe but they have been found in the greatest density in geologically stable regions. This relatively greater abundance of securely identified craters in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions.

The conclusion is properly drawn if which one of the following is assumed?

(A) A meteorite that strikes exactly the same spot as an earlier meteorite will obliterate all traces of the earlier impact.

(B) Rates of destructive geophysical processes within any given region vary markedly throughout geological time.

(C) The rate at which the Earth is struck by meteorites has greatly increased in geologically recent times.

(D) Actual meteorite impacts have been scattered fairly evenly over the Earth's surface in the course of Earth's geological history.

(E) The Earth's geologically stable regions have been studied more intensively by geologists than have its less stable regions.



Hi sagarag and adityadon,

let me first try and give out gist of the para..
craters although seen everywhere are found in max density in geologically stable region. further the author believes that the presence of these securely identified craters is due to the lower rates of destructive geophysical processes in those regions....

look at the word identified, which means there may be many unidentified craters at other locations...
this means there are craters evenly distributed but have remained in original shape only in geologically stable region, as in other regions craters have been obliterated due to the seismic activities...
so D is the correct answer..
now why E is wrong?..
It refutes the claim of the author that the presence of these craters is due to extensive studies here rather than due to stable region..
hope it helped
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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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New post 31 Aug 2016, 00:47
D for me too ...the conclusion says the caters are due to lower rates of destructive processes. ... By dD you understand that the earth was evenly strcuk but the difference of destructive processes account for the observed difference

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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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New post 31 Aug 2016, 02:31
Can sum1 plz explain why option B is wrong?

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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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shonakshi wrote:
Can sum1 plz explain why option B is wrong?


The argument deals with the difference between crater densities in two regions - stable and unstable. Whether in any individual region the stability (i.e., rate of destructive geophysical processes) varies with time does not matter to the argument and hence is out of scope.

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Impact craters caused by meteorites smashing into earth [#permalink]

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New post 14 Jun 2017, 02:48
Impact craters caused by meteorites smashing into earth, have been found all around the globe but they have been found in the greatest density in geologically stable regions. This relatively greater abundance of securely identified craters in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions.

The conclusion is properly drawn if which one of the following is assumed?

(A) A meteorite that strikes exactly the same spot as an earlier meteorite will obliterate all traces of the earlier impact.

(B) Rates of destructive geophysical processes within any given region vary markedly throughout geological time.

(C) The rate at which the Earth is struck by meteorites has greatly increased in geologically recent times.

(D) Actual meteorite impacts have been scattered fairly evenly over the Earth's surface in the course of Earth's geological history.

(E) The Earth's geologically stable regions have been studied more intensively by geologists than have its less stable regions.
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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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New post 14 Jun 2017, 05:56
nguyendinhtuong wrote:
Impact craters caused by meteorites smashing into earth, have been found all around the globe but they have been found in the greatest density in geologically stable regions. This relatively greater abundance of securely identified craters in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions.

The conclusion is properly drawn if which one of the following is assumed?

(A) A meteorite that strikes exactly the same spot as an earlier meteorite will obliterate all traces of the earlier impact.

(B) Rates of destructive geophysical processes within any given region vary markedly throughout geological time.

(C) The rate at which the Earth is struck by meteorites has greatly increased in geologically recent times.

(D) Actual meteorite impacts have been scattered fairly evenly over the Earth's surface in the course of Earth's geological history.

(E) The Earth's geologically stable regions have been studied more intensively by geologists than have its less stable regions.


Try to negate option (D) -

Actual meteorite impacts have not been scattered fairly evenly over the Earth's surface in the course of Earth's geological history.
= Actual meteorite impacts have been concentrated only at a particular region through history.

This contradicts the highlighted statement in the stimulus, hence, (D) is the correct answer....

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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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nguyendinhtuong wrote:
Impact craters caused by meteorites smashing into earth, have been found all around the globe but they have been found in the greatest density in geologically stable regions. This relatively greater abundance of securely identified craters in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions.

The conclusion is properly drawn if which one of the following is assumed?

(A) A meteorite that strikes exactly the same spot as an earlier meteorite will obliterate all traces of the earlier impact.

(B) Rates of destructive geophysical processes within any given region vary markedly throughout geological time.

(C) The rate at which the Earth is struck by meteorites has greatly increased in geologically recent times.

(D) Actual meteorite impacts have been scattered fairly evenly over the Earth's surface in the course of Earth's geological history.

(E) The Earth's geologically stable regions have been studied more intensively by geologists than have its less stable regions.


d it is ..
Impact craters have found in greatest density in geologically stable regions.
Why so :
the lower rates of destructive geophysical processes in those regions.

if we assume that meteorite struck mostly in geologically stable region , it will shatter the conclusion that geographical process is reason for wiping out the traces of craters in geographically unstable regions, and it is the frequency of meteorite showers that is causing abundant craters in geographically stable region.....

We have to assume D......

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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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New post 26 Jul 2017, 22:30
Merged topics. Please, search before posting questions!
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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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New post 24 Oct 2017, 05:35
Impact craters caused by meteorites smashing into earth, have been found all around the globe but they have been found in the greatest density in geologically stable regions. This relatively greater abundance of securely identified craters in geologically stable regions must be explained by the lower rates of destructive geophysical processes in those regions.

Premise: Impact craters caused by meteorites have been found in the greatest density in geologically stable regions.
Conclusion: This occurrence is due to lower rates of destructive geophysical processes in those regions.
We have been asked to identify the gap or assumption linking these two. The argument states that the greater number of craters in geologically stable regions is due to low rates of destructive geophysical processes and not because of some other reason. We probably must eliminate the possibility of any other reason.

D states that the Actual meteorite impacts have been scattered fairly evenly over the Earth's surface in the course of Earth's geological history. - If the impacts have been scattered fairly evenly over the Earth's surface, the large numbers of craters in these regions is not because of high meteorite impacts, thus this is eliminating any alternative reasons and attributing the reason to low rates of destructive geophysical processes. Negate: "Actual meteorite impacts have not been scattered fairly evenly over the Earth's surface in the course of Earth's geological history". This breaks the argument and hence, is the correct answer.

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Re: Impact craters caused by meteorites smashing into earth [#permalink]

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I didn’t choose D because passage says that craters have been found all around the globe .. but we don’t know if they happened evenly.. can someone help?

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Re: Impact craters caused by meteorites smashing into earth   [#permalink] 30 Nov 2017, 00:23
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