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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
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bond001 wrote:
QUESTION 2
CONFUSED BETWEEN D AND E


(D) goes wrong in that its goal is not to figure out the effect of some phenomenon (as in (E) and in the stimulus), but rather to make a straightforward computation. (D) would have been closer if it had evaluated whether something affects the crime rate. That is why D is wrong and E is correct.
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
Saasingh wrote:
Total time : 17 minutes 13 seconds.

6/8 correct.

Got Q2 and Q3 wrong.

Q3 was a haste/silly mistake for me but I do not understand Q2 at all.

Any explanation of Q2.

I chose A
because like El nino, we need to subtract the element from our calculations which distorts the final value. As in, we need to not consider that element, which is extra and which hampers our correct result.
This is analogous to option A. We do not consider whole package weight, because our final result should include only contents of package and not total package material.

I fail to see how option E is correct.

Any help ?


I didn't get 2 either. Had the exact same reasoning. The El Nino distorts our ability to see the actual effects of the volcano on temperature so you have to strip it before doing the analysis.

But, these LSAT passages are absolutely brutal. I got 3 wrong and took me 17 minutes. Are the GMAT questions this difficult?

I have found so far that GMAT RC questions are far easier (from the practice ones available)
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
Sajjad1994 Sir ....Can you please explain question no. 3 and 4??? Nothing about debris is mentioned in the paragraph...so how do we arrive at option D for question 4 ??? I also didn't get why Option B is wrong for question 3
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
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RiteshGadave wrote:
Sajjad1994 Sir ....Can you please explain question no. 3 and 4??? Nothing about debris is mentioned in the paragraph...so how do we arrive at option D for question 4 ??? I also didn't get why Option B is wrong for question 3


Explanation


3. The passage indicates that each of the following can be an effect of the El Niño phenomenon EXCEPT:

Difficulty Level: 700

Explanation

The important thing here is that you restrict your analysis to Paragraph 2 and the early part of Paragraph 3, the only places in which El Niño comes into play. From lines 18-29 we basically get four facts about El Niño, and not coincidentally, those four facts have been turned into the four wrong choices.

Lines 18-22 say that El Niño warms the surface of the Pacific and hence—choice (C)"warms the atmosphere." Paragraph 2 continues by noting that an El Niño can “mask the cooling brought about by” a volcano erupting —that’s (B); and then it says that, conversely, an El Niño can “mimic...cooling,” i.e. can make things seem cooler than they really are. That’s (A).

As a result, says Paragraph 3, by eliminating El Niño from the calculations you can get a truer picture, one that gets to the heart of the volcano-climate connection. That’s (E).

(D) is perhaps hard to fix upon because its use of the phrase “masks cooling” conjures up a point (line 23) that is in the midst of the El Niño discussion. But the whole concept of “feedback loops” doesn’t arise until two paragraph’s later! Paragraph 4 is about a whole different kind of relationship between volcanoes and climate, and by then we’ve left all consideration of El Niño far behind. If you chose (D) as an effect of El Niño you were working too hard to see a “feedback loop” at work in lines 18-29. The author doesn’t use the phrase in that specific context, so why should we?

Answer: D


4. Which one of the following most accurately characterizes what the author of the passage means by a “minor” volcanic eruption (line 30)?

Difficulty Level: 650

Explanation

“Minor eruptions” are polished off briskly, both by Mass & Portman and by the author. When you discount the effects of El Niño, says lines 30-32, “minor eruptions have no discernible effect on temperature. And major, dust-spitting explosions,...”—that emphasis is ours, to highlight that the minor eruptions in question are used by the author to contrast with the big dust-spitters. (D) is a discreet paraphrase of “minor dust-spitter.”

(A) The issue ever since line 3 has been dust, not lava. Remember sentence 1? The entire passage is concerned with what happens “long after the lava has cooled.”

(B) is a distortion that takes two issues, global temperature and the names of two major volcanic events, and merges them together unacceptably. To the author, an eruption is “minor” or “major” sheerly because of its dust quotient, and not because of its effect on temperature. (B)’s focus on Krakatau and El Chichón is too narrow and misses the point.

(C), (E) Minor eruptions “have no discernible effect on temperature,” so there’s nothing to mask, (C), and no drop in average hemispheric temperature is caused, (E).

Answer: D


Explanation Credit: Kaplan LSAT
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
Thank you so much sir...I get it now.
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
Please elaborate the question no. 2.
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
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dharam44 wrote:
Please elaborate the question no. 2.


Explanation


2. Not taking the effects of El Niño into account when figuring the effect of volcanic eruptions on Earth’s climate is most closely analogous to not taking into account the

Difficulty Level: 750

Explanation

El Niño, you’ll recall, is a major weather phenomenon whose warming effect can either mask a volcanic eruption’s cooling, or mimic it (lines 23-26). Once El Niño’s effect is subtracted, the effect of a volcanic eruption on global climate is seen to be minimal. Not having subtracted El Niño, then—and that’s what the question asks us to consider—leads to a logical distortion. Doing so would be tantamount to ignoring a huge alternative explanation for certain climatic conditions, one that renders dubious indeed any conclusions drawn about volcanoes’ influence.

So an analogous situation will involve the failure to subtract some key factor that ought at least to be considered in drawing one’s conclusion. And this is what (E) presents. Before you decide that the change in a population’s average age must be due to a higher birth rate, better check out other plausible explanations—such as the one (E) suggests, the ages of new immigrants to the country. Maybe so many of them are old or young that that is what caused the higher average age; maybe the birth rate is really stable (just as volcanic eruptions are really negligible in terms of climatic change). Ignoring those immigrants would be like ignoring El Niño—turning a blind eye to an alternative explanation.

(A) To not take into account “the weight of the package as a whole” when trying to determine the contents’ weight would be impossible—unless you were to remove the contents and weigh them separately, in which case the weight of the overall package would be of no interest to you. Either way, (A) isn’t a case of misleading data.

(B) If your goal was to count the number of coins in a pile, it would be totally appropriate to not take into account the coins’ monetary value.

(C) Without field-specific, technical knowledge uncalled-for by the LSAT, it is difficult to imagine how not taking into account lens magnification would affect the determination of an object’s shape. The shape is what it is; the magnification, inferably, might affect its size but not its shape.

(D) goes wrong in that its goal is not to figure out the effect of some phenomenon (as in (E) and in the stimulus), but rather to make a straightforward computation. (D) would have been closer if it had evaluated whether something affects the crime rate.

Answer: E


Explanation Credit: Kaplan LSAT
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
I got Qns 2 correct. Even I was stuck between option D and E.

2. Not taking the effects of El Niño into account when figuring the effect of volcanic eruptions on Earth’s climate is most closely analogous to not taking into account the

(D) number of false crime reports in a city when figuring the average annual number of crimes committed in that city
(E) ages of new immigrants to a country before attributing a change in the average of the country’s population to a change in the number of birth

My reasoining for chosing option E are as below.

In determining the effects on temperature, the effects of EL Nino were not taking into consideration and all the temperature
changes were attributed to volcanic eruptions, similarly all the population change was attributed to new births without taking into consideration the age of immigrant children.

eliminating option D is a bit tricky. Option E, as does the passage, introduces a completely NEW phenomenon to refute
the calculations whereas D just infers that there may have been some false statistics while calculating.
So if D were to be the right option, the passage might have suggested some error in calculating temperature variation and
not a completely new reason (EL Nino) to overshadow the effects of volcanic eruptions.
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
Sajjad1994 wrote:
dharam44 wrote:
Please elaborate the question no. 2.


Explanation


2. Not taking the effects of El Niño into account when figuring the effect of volcanic eruptions on Earth’s climate is most closely analogous to not taking into account the

Difficulty Level: 750

Explanation

El Niño, you’ll recall, is a major weather phenomenon whose warming effect can either mask a volcanic eruption’s cooling, or mimic it (lines 23-26). Once El Niño’s effect is subtracted, the effect of a volcanic eruption on global climate is seen to be minimal. Not having subtracted El Niño, then—and that’s what the question asks us to consider—leads to a logical distortion. Doing so would be tantamount to ignoring a huge alternative explanation for certain climatic conditions, one that renders dubious indeed any conclusions drawn about volcanoes’ influence.

So an analogous situation will involve the failure to subtract some key factor that ought at least to be considered in drawing one’s conclusion. And this is what (E) presents. Before you decide that the change in a population’s average age must be due to a higher birth rate, better check out other plausible explanations—such as the one (E) suggests, the ages of new immigrants to the country. Maybe so many of them are old or young that that is what caused the higher average age; maybe the birth rate is really stable (just as volcanic eruptions are really negligible in terms of climatic change). Ignoring those immigrants would be like ignoring El Niño—turning a blind eye to an alternative explanation.

(A) To not take into account “the weight of the package as a whole” when trying to determine the contents’ weight would be impossible—unless you were to remove the contents and weigh them separately, in which case the weight of the overall package would be of no interest to you. Either way, (A) isn’t a case of misleading data.

(B) If your goal was to count the number of coins in a pile, it would be totally appropriate to not take into account the coins’ monetary value.

(C) Without field-specific, technical knowledge uncalled-for by the LSAT, it is difficult to imagine how not taking into account lens magnification would affect the determination of an object’s shape. The shape is what it is; the magnification, inferably, might affect its size but not its shape.

(D) goes wrong in that its goal is not to figure out the effect of some phenomenon (as in (E) and in the stimulus), but rather to make a straightforward computation. (D) would have been closer if it had evaluated whether something affects the crime rate.

Answer: E


Explanation Credit: Kaplan LSAT


Why I didn't choose E is because El Nino played a huge role in the analysis of the effect of volcanic eruptions on climate, whereas the new immigrant number might well be minimal when compared to the entire population of a country, so it may not have that much of an effect. Again, I say "may not" , because we simply do not have enough data to comment. I feel E is a very incomplete option
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
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Saasingh wrote:
Total time : 17 minutes 13 seconds.

6/8 correct.

Got Q2 and Q3 wrong.

Q3 was a haste/silly mistake for me but I do not understand Q2 at all.

Any explanation of Q2.

I chose A
because like El nino, we need to subtract the element from our calculations which distorts the final value. As in, we need to not consider that element, which is extra and which hampers our correct result.
This is analogous to option A. We do not consider whole package weight, because our final result should include only contents of package and not total package material.

I fail to see how option E is correct.

Any help ?


You were on the right path but if you read option A carefully, it will only skew the results in one direction, i.e adding package weight will only give increased weight whereas El-nino can either amplify the cooling impact or dampen it.
Option E corrects this gap. The immigrant population can either increase or decrease avg. age depending on the age of the immigrants, hence it is more analogous.

Hope this helps!!
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Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
Hi GMATNinja GMATNinjaTwo VeritasKarishma
Can you please explain why choice A is incorrect for Q3?
The option says making the cooling effect of a volcanic eruption appear to be more pronounced than it actually is

In the passage it is given that

Such warming can mask the cooling brought about by
an eruption, but it can also mimic volcanic cooling if
(25) the volcano happens to erupt just as an El Niño
induced warm period is beginning to fade

From these lines I understand that elNino can make things as cool as a volcanic eruption under some conditions, at best. I'm not sure how it can be implied that the cooling effect by volcanic eruptions can be amplified by el Nino.

Could you please help me with this?
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
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Question 1 - main point.

Correct answer D. The author hasn't tried to argue whether the effects of volcanic eruptions are greater or not, but just presented sides. He also hasn't tried to compare variances in global vs regional, but just used those as examples to say that the effects could be large or small, so A, B and C are out. Finally E is completely out of scope as the main point isn't to criticize researchers.

Question 2 - impact of El-nino's analogy.

El-nino basically has an effect due to which the volcanic effect isn't as large. so to get an realistic analysis of the volcanic effect, we need to filter out Elnino's effect.

From the choices given, only E does something similar. you can't say that a countries population (in our case the temperate) has increased (decreased for us) because of more births. since immigrants (El-nino) have increased the population as well, the effects of more births (volcanic eruptions for us) is lesser than expected

Question 3 - effect of Elnino except.

Again, Elnino basically masks the volcanic effect. A,B and E say exactly that. C - warming of equatorial waters is mentioned. D is correct due to also process of elimination, but also because feedback loops are mentions in paragraph three which isn't related to Elnino

Question 4 - what are minor erupsions

reading on from line 30 "And major, dust-spitting explosions, such as Krakatau, or El Chichón"... thus a minor eruption is not a major dust-spitting explosion hence D

Question 5 - what is a feedback loop.

Tough question, moreso also because the answer choices are long. But what exactly is a feedback loop to start with? Something small which later on becomes something bigger due to domino effects in the middle. So all you're looking for is a small effect which leads to same effect later. only A answers that. decaying matter in soil leads to more decaying matter in soil. Wolves leading to animals is close, but A is the better option - the others aren't talking about the same effect

Question 6 - what hypothesis would the author not agree with

So from reading the passage we know that the author present 2 sorts of point of views and nothing extreme. for A, half a degree is mentioned, so this is out. B major eruptions don't induce elnino, they happen serpately. C is correct because the last paragraph is all about the feedback loop where things happens indirectly. D again mentions one degree which half a degree in the passage, and the difference is 0-0.5, and E is wrong also because passage 2 is all about how Elnino has an impact

Question 7 - least evidence for which of the following claims.

Okay, so the hardest question of the lot, moreso because you may also not know what discernable means. hence how do you eliminate A? is discernable big impact or a small impact? if its big, A is wrong, if its small, this could be right. so lets ignore this for now.
B - major eruptions have a smaller impact. The 2nd passage is all about this.
Aha - so what does B actually do? it actually answer A. Why would you have 2 options choices saying major eruptions have a smaller impact? so A must mean the volcanic eruptions have a big impact. so that was mentioned in passage 1, hence A is out also.
And now you've figured out what discernable kind of means.
D - mentioned in para 2.

so now you're down to C and E. For E, at end of passage 2, the author mentions the major eruptions have an impact in the opposite hemisphire, but it doesn't talk about minor eruptions, and for C, the passage talking multiple times of volcanic eruptions. so you may have to guess - the trick is that passage 2 is about global temps and passage 3 is about regional temps. choice C is about major eruptions not having a big impact in regional temps, but the whole passage is about them having, so it'd kind of opposite of what the author is saying.

Anyone have any idea how to eliminate E properly here?


Question 8 - purpose of last para

the author presents the last para really to talk about the effect a volcanic eruption can have. which goes again para 2. he talks about the feedback loop, which is a small change making an impact. C directly talks about this. B, D and E are completely out since the author never mentions them. you may be confused between A and C, because the author mentions a year without summer, but that is the opposite. A feedback loop results in year without summer. Hence C

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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
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elPatron434 wrote:
Hi GMATNinja GMATNinjaTwo VeritasKarishma
Can you please explain why choice A is incorrect for Q3?
The option says making the cooling effect of a volcanic eruption appear to be more pronounced than it actually is

In the passage it is given that

Such warming can mask the cooling brought about by
an eruption, but it can also mimic volcanic cooling if
(25) the volcano happens to erupt just as an El Niño
induced warm period is beginning to fade

From these lines I understand that elNino can make things as cool as a volcanic eruption under some conditions, at best. I'm not sure how it can be implied that the cooling effect by volcanic eruptions can be amplified by el Nino.

Could you please help me with this?


Hi elPatron434

You are correct in your understanding that the ElNino makes things as cool as a volcanic eruption. But that does not mean that at the time temperature was as down as it could be. Suppose Volcanic eruption could take temp. to -20 degrees C. and ElNino can also mimic this. But What if ElNino mimicked this temperature but the Volcanic eruption did not take the temp to this low. Now it will make you will understand that Elnino made it more pronounced than it actually is/was.

(A) making the cooling effect of a volcanic eruption appear to be more pronounced than it actually is


P.S: I also got this question wrong for the same reason, but after that when I analyzed it made sense.
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
hi Sajjad1994

can you please explain question 7
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
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starbuzz wrote:
hi Sajjad1994

can you please explain question 7


Explanation


7. The information in the passage provides the LEAST support for which one of the following claims?

Difficulty Level: 700

Explanation

This is an Except question and looking for the odd man out. Four of the choices are supported by the text; one is not.

(A) directly echoes lines 32-37. The effect of major eruptions on global temperature is discernible—if minor.

(B) When you compare the conclusion in lines 32-37 with what “researchers have generally thought” as described back in lines 5-12, you have to acknowledge that volcanoes aren’t given the same amount of credit for the temperature change that they used to be.

(C) directly contradicts (A) which—as we’ve just seen—itself directly echoes the passage in Paragraph 3. So (C) is what we want here. The big, big eruptions do have an effect, albeit less than was previously supposed.

(D), (E) Since “minor eruptions have no discernible effect on temperature” (lines 30-31), the hemisphere is irrelevant, so (D) and (E) follow from Mass and Portman’s findings.

Answer: C
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Re: Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
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Sajjad1994 wrote:
dharam44 wrote:
Please elaborate the question no. 2.


Explanation


2. Not taking the effects of El Niño into account when figuring the effect of volcanic eruptions on Earth’s climate is most closely analogous to not taking into account the

Difficulty Level: 750

Explanation

El Niño, you’ll recall, is a major weather phenomenon whose warming effect can either mask a volcanic eruption’s cooling, or mimic it (lines 23-26). Once El Niño’s effect is subtracted, the effect of a volcanic eruption on global climate is seen to be minimal. Not having subtracted El Niño, then—and that’s what the question asks us to consider—leads to a logical distortion. Doing so would be tantamount to ignoring a huge alternative explanation for certain climatic conditions, one that renders dubious indeed any conclusions drawn about volcanoes’ influence.

So an analogous situation will involve the failure to subtract some key factor that ought at least to be considered in drawing one’s conclusion. And this is what (E) presents. Before you decide that the change in a population’s average age must be due to a higher birth rate, better check out other plausible explanations—such as the one (E) suggests, the ages of new immigrants to the country. Maybe so many of them are old or young that that is what caused the higher average age; maybe the birth rate is really stable (just as volcanic eruptions are really negligible in terms of climatic change). Ignoring those immigrants would be like ignoring El Niño—turning a blind eye to an alternative explanation.

(A) To not take into account “the weight of the package as a whole” when trying to determine the contents’ weight would be impossible—unless you were to remove the contents and weigh them separately, in which case the weight of the overall package would be of no interest to you. Either way, (A) isn’t a case of misleading data.

(B) If your goal was to count the number of coins in a pile, it would be totally appropriate to not take into account the coins’ monetary value.

(C) Without field-specific, technical knowledge uncalled-for by the LSAT, it is difficult to imagine how not taking into account lens magnification would affect the determination of an object’s shape. The shape is what it is; the magnification, inferably, might affect its size but not its shape.

(D) goes wrong in that its goal is not to figure out the effect of some phenomenon (as in (E) and in the stimulus), but rather to make a straightforward computation. (D) would have been closer if it had evaluated whether something affects the crime rate.

Answer: E


Explanation Credit: Kaplan LSAT


Kindly explain the following query related to option D and E

(D) number of false crime reports in a city when figuring the average annual number of crimes committed in that city - If we dont take into account the number of false crime reports, it will inflate the average annual number of crimes because false crime reports will also be added to the total. This is akin to how if effects of el nino are not subtracted may inflate our estimate of increase in global temperature
(E) ages of new immigrants to a country before attributing a change in the average of the country’s population to a change in the number of births - here ages of new immigrants is being compared to change in population. You cant add age to population or number of births. use of "thoese of" or "that of" is missing suggesting that age is being added to number of births which is being used to calculate country's population.

Kindly explain
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Long after the lava has cooled, the effects of a major volcanic erupti [#permalink]
Can you please post the answer to Q6. I chose A and want to see the OA.
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