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Of the two types of supervolcanoes, only one

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Of the two types of supervolcanoes, only one [#permalink]

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New post 11 Jan 2018, 12:24
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Question 1
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Question Stats:

59% (09:03) correct 41% (01:37) wrong based on 295

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Question 2
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54% (00:40) correct 46% (00:35) wrong based on 284

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Question 3
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Question Stats:

53% (00:19) correct 47% (00:18) wrong based on 290

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Question 4
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Question Stats:

64% (00:48) correct 36% (00:29) wrong based on 266

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Of the two types of supervolcanoes, only one -- massive eruptions, which eject at least 1,000 km3 of pyroclastic material -- actually fits the popular conception of a volcano. Unlike lesser volcanoes, massive eruptions do not form mountains. Instead, the land collapses into the magma chamber below, forming circular depressions called calderas, some of which are more than 25 kilometers in diameter. These calderas can last for millions of years after the volcanic activity has subsided. Probably the best known of these eruptions is the one that occurred at Lake Toba in Indonesia about 75,000 years ago. This eruption led to a volcanic winter and killed about 60% of the human population.

The other type of supervolcano, a large igneous province (LIP), forms in oceans, on continents, and on margins between the two. They are caused by flood basalt eruptions, which are triggered perhaps by rising mantle plume heads encountering the lithosphere and melting, or perhaps by large meteorite impacts. These provinces are the size of continents and are formed over millions of years, a geologically brief time period. Like massive eruptions, LIPs have been linked to extinctions, though less conclusively. LIPs release sulfate gas, which becomes sulfate acid in the atmosphere, absorbing heat and causing the temperature to drop precipitously, perhaps fatally for some life forms. LIPs can also reduce the amount of oxygen in seawater to a dangerously low level.

According to the passage, the eruption of a flood basalt plateau could lead to

A) the collapsing of land into a magma chamber
B) a change in the composition of seawater
C) the creation of a mantle plume
D) a volcanic winter
E) the wide dissemination of pyroclastic matter


Question Which of the following can be inferred from the passage?

A) The eruption at Lake Toba created a caldera.
B) Most people would not think of massive eruptors as volcanoes.
C) The force of a meteorite hitting the Earth may be responsible for mantle plumes rising to the lithosphere.
D) LIPs have been linked to fewer extinction events than have massive eruptions.
E) Massive eruptors do not release sulfate gases.


The primary purpose of the passage is to:

point out the differences between two geological events
discuss the origins of a class of natural occurrences
examine a controversial scientific viewpoint
provide a brief chronological outline of a series of cataclysmic events
give an overview of two related phenomena


Each of the following is described as characteristic of some volcanoes EXCEPT

A) the creation of mountains
B) formations that exist for millions of years after a volcano has been active
C) an overheating of the atmosphere
D) very large oceanic provinces
E) eruptions that have been fatal to humans


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Re: Of the two types of supervolcanoes, only one [#permalink]

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New post 12 Jan 2018, 04:45
These are my reasoning

Ques 1- According to the passage, the eruption of a flood basalt plateau could lead to

A) the collapsing of land into a magma chamber
-> incorrect
This is cause of 'massive eruption'
B) a change in the composition of seawater
-> correct
a flood basalt plateau connected to LIP(Large igneous province)
2nd paragraph explaine about LIP.
Last sentence of 2nd paragraph explained that 'LIP can also reduce the amount of oxygen in seawater to a dangerously low level'
C) the creation of a mantle plume
-> incorrect
This is not result of LIP, but cause of LIP.
Also, there is a word 'perhaps', so we also cannot assure that mantle plume is absolute cause of LIP
D) a volcanic winter
-> incorrect.
This is about 'massive eruption'
E) the wide dissemination of pyroclastic matter
-> incorrect
This is about result of 'massive eruption'

Ques 2- Question Which of the following can be inferred from the passage?

A) The eruption at Lake Toba created a caldera.
-> correct. This is about contents of 1st paragraph
B) Most people would not think of massive eruptors as volcanoes.
-> incorrect. It is possible or not.
C) The force of a meteorite hitting the Earth may be responsible for mantle plumes rising to the lithosphere.
-> Both are cause of 'massive eruption'
D) LIPs have been linked to fewer extinction events than have massive eruptions.
-> Not mentioned. We cannot know about this.
E) Massive eruptors do not release sulfate gases.
-> Not mentioned. We cannot know about this.

Ques3-The primary purpose of the passage is to:

point out the differences between two geological events
-> incorrect.
At 2nd paragraph, we can see the sentence 'Like massive eruption, ~'
: It means that the purpose of passage is not point out difference
discuss the origins of a class of natural occurrences
-> Not mentioned about the origins.
examine a controversial scientific viewpoint
-> incorrect. This passage just explains about phenomenons. There is no viewpoint.
provide a brief chronological outline of a series of cataclysmic events
-> incorrect. There is no chronological ouline.
give an overview of two related phenomena
-> correct. This is only left thing.

Ques 4- Each of the following is described as characteristic of some volcanoes EXCEPT

A) the creation of mountains
-> 2nd sentence of 1st paragraph said 'Unlike lesser volcanoes, massive eruption do not form mountains'
It means that lesser volcano forms mountains.
So A is no problem
B) formations that exist for millions of years after a volcano has been active
-> 4th sentance of 1st paragraph said 'These calderas can last for millions of years after the volcanic activity has subsided'
So B is no problem
C) an overheating of the atmosphere
-> Except!!
No overheating!!
D) very large oceanic provinces
-> LIP forms in oceans ,and is size of continents.
So D is no problem
E) eruptions that have been fatal to humans
-> 'Massive eruptions' killed about 60% of the human population.
So E is no problem
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Re: Of the two types of supervolcanoes, only one [#permalink]

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New post 17 Jan 2018, 09:30
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Re: Of the two types of supervolcanoes, only one [#permalink]

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New post 30 Mar 2018, 19:23
HG0815 wrote:
These are my reasoning

Ques3-The primary purpose of the passage is to:

point out the differences between two geological events
-> incorrect.
At 2nd paragraph, we can see the sentence 'Like massive eruption, ~'
: It means that the purpose of passage is not point out difference
discuss the origins of a class of natural occurrences
-> Not mentioned about the origins.
examine a controversial scientific viewpoint
-> incorrect. This passage just explains about phenomenons. There is no viewpoint.
provide a brief chronological outline of a series of cataclysmic events
-> incorrect. There is no chronological ouline.
give an overview of two related phenomena
-> correct. This is only left thing.


I'm afraid I don't agree with this. The answer might be correct, but I cannot empathize with the argument here.

First: If we are to rely on precise extracts, what more than the very beginning of the text! "Of the two types of supervolcanoes, only one ... actually fits". I even consider this more determining than a phrase mid/paragraph.

Second: Precisely your quoted part of the text seems to further the comparisons: "Like massive eruptions, LIPs have been linked to extinctions, though less conclusively.

I don't know about you guys, but I feel this question in particular is not up to par with something built by GMAC.

Looking forward to debate it further!
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Re: Of the two types of supervolcanoes, only one [#permalink]

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New post 08 Apr 2018, 04:07
Good passage.
All correct - 9 minutes

Please can someone confirm the level of this passage?
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Re: Of the two types of supervolcanoes, only one [#permalink]

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New post 08 May 2018, 05:33
JohnAHD wrote:
HG0815 wrote:
These are my reasoning

Ques3-The primary purpose of the passage is to:

point out the differences between two geological events
-> incorrect.
At 2nd paragraph, we can see the sentence 'Like massive eruption, ~'
: It means that the purpose of passage is not point out difference
discuss the origins of a class of natural occurrences
-> Not mentioned about the origins.
examine a controversial scientific viewpoint
-> incorrect. This passage just explains about phenomenons. There is no viewpoint.
provide a brief chronological outline of a series of cataclysmic events
-> incorrect. There is no chronological ouline.
give an overview of two related phenomena
-> correct. This is only left thing.


I'm afraid I don't agree with this. The answer might be correct, but I cannot empathize with the argument here.

First: If we are to rely on precise extracts, what more than the very beginning of the text! "Of the two types of supervolcanoes, only one ... actually fits". I even consider this more determining than a phrase mid/paragraph.

Second: Precisely your quoted part of the text seems to further the comparisons: "Like massive eruptions, LIPs have been linked to extinctions, though less conclusively.

I don't know about you guys, but I feel this question in particular is not up to par with something built by GMAC.

Looking forward to debate it further!

I also picked A and can't really understand yet why E is the better option.

It is true that the passage isn't exclusively pointing out differences between the two types of volcanoes but this is the main focus imo.

To me, an overview is a bit more of a wholesome description and we actually do find quite a few facts about the two types of volcanoes. Maybe that is the explanation for the correct answer.

What do you think?
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Re: Of the two types of supervolcanoes, only one   [#permalink] 08 May 2018, 05:33
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Of the two types of supervolcanoes, only one

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