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# The popular view is that Ozone layer’s depletion-"Tough one"

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The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  03 Feb 2013, 20:18
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Another week starts and here's the question for this week from e-GMAT:

The popular view is that Ozone layer’s depletion is real, as certain as Neil Armstrong's landing on the moon. While that may be the case, the attribution of such depletion to man-made chemicals is not true. Mount Pinatubo in the Philippines spewed forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history. Mankind can't possibly equal the output of even one eruption from Pinatubo, much less 4 billion years' worth of them, so how can it be held responsible for destroying ozone.

Which of the following is an assumption on which the argument of the author depends?

A. It would take mankind more than 4 billion years to destroy Ozone.
B. Each molecule of ozone depleting chemical released during an eruption of Mount Pinatubo destroys the same quantity of ozone as a molecule of fluorocarbons.
C. The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much higher than the quantity of fluorocarbons produced by the companies
D. The molecular structure of ozone-depleting chemicals released during a volcanic eruption does not prevent them from reaching the stratosphere, the layer of the atmosphere where the ozone layer resides.
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released.

Happy Solving!

-Chiranjeev
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Re: An assumption question - a tough nut to crack [#permalink]  03 Feb 2013, 20:51
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Even though this post was reserved for posting official solution and explanation, given the quality of discussions on this forum, I think it would only help the students if they go through the thread and understand different doubts and discussion points.

Therefore, the official solution and explanations have been posted at the end of this thread.

-Chiranjeev Singh
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Last edited by egmat on 12 Feb 2013, 22:55, edited 1 time in total.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  03 Feb 2013, 23:48
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egmat wrote:
Another week starts and here's the question for this week from e-GMAT:

The popular view is that Ozone layer’s depletion is real, as certain as Neil Armstrong's landing on the moon. While that may be the case, the attribution of such depletion to man-made chemicals is not true. Mount Pinatubo in the Philippines spewed forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history. Mankind can't possibly equal the output of even one eruption from Pinatubo, much less 4 billion years' worth of them, so how can it be held responsible for destroying ozone.

Which of the following is an assumption on which the argument of the author depends?

A. It would take mankind more than 4 billion years to destroy Ozone.
B. Each molecule of ozone depleting chemical released during an eruption of Mount Pinatubo destroys the same quantity of ozone as a molecule of fluorocarbons.
C. The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much higher than the quantity of fluorocarbons produced by the companies
D. The molecular structure of ozone-depleting chemicals released during a volcanic eruption does not prevent them from reaching the stratosphere, the layer of the atmosphere where the ozone layer resides.
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released.

Happy Solving!

-Chiranjeev

Premise: A volcanic eruption spews forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history. There has been so many of such eruptions.
Conclusion: Humans cannot be held responsible for destroying ozone.

We can see that the author's argument is based on the quantity of chemicals released. So the assumption would be based on that. Among the choices, E best fits as the assumption as it says that it is only the quantity of chemicals released that is important. Factors such as rate of release is less important.

Choice B is close but we do not know how many molecules are there in each case. If there are significantly more molecules of flourocarbons released then man caused destruction could also be significant.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 00:33
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The popular view is that Ozone layer’s depletion is real, as certain as Neil Armstrong's landing on the moon. While that may be the case, the attribution of such depletion to man-made chemicals is not true. Mount Pinatubo in the Philippines spewed forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history. Mankind can't possibly equal the output of even one eruption from Pinatubo, much less 4 billion years' worth of them, so how can it be held responsible for destroying ozone.

Which of the following is an assumption on which the argument of the author depends?

A. It would take mankind more than 4 billion years to destroy Ozone. how many years is not the question, but the question is that can mankind be responsible for ozone depletion ?
B. Each molecule of ozone depleting chemical released during an eruption of Mount Pinatubo destroys the same quantity of ozone as a molecule of fluorocarbons. may be less but may be even more
C. The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much higher than the quantity of fluorocarbons produced by the companies not an assumption, already mentioned in the argument
D. The molecular structure of ozone-depleting chemicals released during a volcanic eruption does not prevent them from reaching the stratosphere, the layer of the atmosphere where the ozone layer resides.
negate this - if the molecules from Volcanic eruptions can't reach the ozone layer, they wont deplete it
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released. we don't really know whose rate is higher - volcanic eruption or industries
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 00:34
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very good question egmat. +1 to you.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 01:17
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The popular view is that Ozone layer’s depletion is real, as certain as Neil Armstrong's landing on the moon. While that may be the case, the attribution of such depletion to man-made chemicals is not true. Mount Pinatubo in the Philippines spewed forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history. Mankind can't possibly equal the output of even one eruption from Pinatubo, much less 4 billion years' worth of them, so how can it be held responsible for destroying ozone.

Which of the following is an assumption on which the argument of the author depends?

A. It would take mankind more than 4 billion years to destroy Ozone. how many years is not the question, but the question is that can mankind be responsible for ozone depletion ?
B. Each molecule of ozone depleting chemical released during an eruption of Mount Pinatubo destroys the same quantity of ozone as a molecule of fluorocarbons. may be less but may be even more
C. The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much higher than the quantity of fluorocarbons produced by the companies not an assumption, already mentioned in the argument
D. The molecular structure of ozone-depleting chemicals released during a volcanic eruption does not prevent them from reaching the stratosphere, the layer of the atmosphere where the ozone layer resides.
negate this - if the molecules from Volcanic eruptions can't reach the ozone layer, they wont deplete it
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released. we don't really know whose rate is higher - volcanic eruption or industries

The logic of Choice D that chemicals released in a volcanic eruption may not reach the stratosphere and therefore not destroy ozone is fine but the problem is it is not related to the author's argument. You would want to select a choice that relates to the author's argument and Choice E does that best. This is because the author makes his point by saying that the quantity of chemicals released in a volcanic eruption is enormously more than that released in man-made reactions. So his central assumption is that quantity of chemicals released determines how much of ozone is destroyed. Choice E represents that assumption by saying factors other than quantity released such as the rate of release of chemicals are not important.
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Last edited by SravnaTestPrep on 04 Feb 2013, 01:29, edited 1 time in total.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 01:26
egmat wrote:
Another week starts and here's the question for this week from e-GMAT:

The popular view is that Ozone layer’s depletion is real, as certain as Neil Armstrong's landing on the moon. While that may be the case, the attribution of such depletion to man-made chemicals is not true. Mount Pinatubo in the Philippines spewed forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history. Mankind can't possibly equal the output of even one eruption from Pinatubo, much less 4 billion years' worth of them, so how can it be held responsible for destroying ozone.

Which of the following is an assumption on which the argument of the author depends?

A. It would take mankind more than 4 billion years to destroy Ozone.
B. Each molecule of ozone depleting chemical released during an eruption of Mount Pinatubo destroys the same quantity of ozone as a molecule of fluorocarbons.
C. The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much higher than the quantity of fluorocarbons produced by the companies
D. The molecular structure of ozone-depleting chemicals released during a volcanic eruption does not prevent them from reaching the stratosphere, the layer of the atmosphere where the ozone layer resides.
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released.

Happy Solving!

-Chiranjeev

Hi all,

Frankly, i'd say that C is the assumption that we're looking for : If you negate it, you will have : The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much lower than the quantity of fluorocarbons produced by the companies. In other words and based on the argument, and if it is true, man-made chemicals like fluorocarbons are responsible for destroying ozone and therefore the argument will not be valid at all
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 02:54
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Rock750 wrote:
egmat wrote:
Another week starts and here's the question for this week from e-GMAT:

The popular view is that Ozone layer’s depletion is real, as certain as Neil Armstrong's landing on the moon. While that may be the case, the attribution of such depletion to man-made chemicals is not true. Mount Pinatubo in the Philippines spewed forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history. Mankind can't possibly equal the output of even one eruption from Pinatubo, much less 4 billion years' worth of them, so how can it be held responsible for destroying ozone.

Which of the following is an assumption on which the argument of the author depends?

A. It would take mankind more than 4 billion years to destroy Ozone.
B. Each molecule of ozone depleting chemical released during an eruption of Mount Pinatubo destroys the same quantity of ozone as a molecule of fluorocarbons.
C. The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much higher than the quantity of fluorocarbons produced by the companies
D. The molecular structure of ozone-depleting chemicals released during a volcanic eruption does not prevent them from reaching the stratosphere, the layer of the atmosphere where the ozone layer resides.
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released.

Happy Solving!

-Chiranjeev

Hi all,

Frankly, i'd say that C is the assumption that we're looking for : If you negate it, you will have : The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much lower than the quantity of fluorocarbons produced by the companies. In other words and based on the argument, and if it is true, man-made chemicals like fluorocarbons are responsible for destroying ozone and therefore the argument will not be valid at all

C we already know these information. at least C is an inference question

E must be the answer though D is tempting
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 05:12
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Conclusion :- Ozone Depleting chemicals from volcano eruptions have depleted the ozone layer more than man made ozone depleting chemicals because the quantity of chemicals from volcano is more than man made chemicals

Assumption :- even if the quantity is more, the chemicals from volcano should actually cause the depletion

A. It would take mankind more than 4 billion years to destroy Ozone. - OFS, from the given premise the quantity of man made chemicals will always be lower than natural chemicals
B. Each molecule of ozone depleting chemical released during an eruption of Mount Pinatubo destroys the same quantity of ozone as a molecule of fluorocarbons. - OFS the amount of ozone destroyed by a single amount is not the scope of passage
C. The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much higher than the quantity of fluorocarbons produced by the companies - already stated in the passage, and our scope is total quantity not only 1 eruption
D. The molecular structure of ozone-depleting chemicals released during a volcanic eruption does not prevent them from reaching the stratosphere, the layer of the atmosphere where the ozone layer resides. - Correct, if for some reason the chemical from volcano does not reach the ozone layer then chemical from volcano cannot be the cause of ozone depletion.
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released. - this option states that rate is not as important as quantity, if we negate this option then it becomes rate is as important as quantity does this break the conclusion ? no, because we do not know whose rate is higher volcano or man made, if man made chemicals rate is higher then the conclusion breaks but if volcanos rate is higher then the conclusion is reinforced because in this situation both the rate and quantity of volcano is higher than man made.

IMO :- D
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 07:00
Dinesh2Apr wrote:
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released. - this option states that rate is not as important as quantity, if we negate this option then it becomes rate is as important as quantity does this break the conclusion ? no, because we do not know whose rate is higher volcano or man made, if man made chemicals rate is higher then the conclusion breaks but if volcanos rate is higher then the conclusion is reinforced because in this situation both the rate and quantity of volcano is higher than man made.

Dear Dinesh2Apr,

It does not matter whether the rate of chemicals released in a volcanic eruption is greater or not. The point is that there is another factor than quantity of chemicals released that may determine how much of ozone is destroyed. Think of it this way. Instead of calling it as rate of release call it as another factor. So the choice would say that there are no other factors than quantity that determines how much of ozone is destroyed. Thus we can see that the author's conclusion would hold absolutely only when quantity is the only factor that determines how much of ozone is destroyed. If there are other factors his argument is not air tight. That is the conclusion would not logically follow from the premise.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 07:47
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The popular view is that Ozone layer’s depletion is real, as certain as Neil Armstrong's landing on the moon. While that may be the case, the attribution of such depletion to man-made chemicals is not true. Mount Pinatubo in the Philippines spewed forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history. Mankind can't possibly equal the output of even one eruption from Pinatubo, much less 4 billion years' worth of them, so how can it be held responsible for destroying ozone.

Paraphrase: Ozone layer depletion is real, but human is not the culprit. Why ? - Only one volcanic eruption released much more ozone-depleting chemicals than humans have ever produced. And since mankind can't even match one of them, mankind cannot be the culprit
.

Author trying to accuse the nature and exonerate humans.

Which of the following is an assumption on which the argument of the author depends?

A. It would take mankind more than 4 billion years to destroy Ozone. - Doesn't help authors purpose, we are not bothered how many years does it take. we are looking at who is responsible

B. Each molecule of ozone depleting chemical released during an eruption of Mount Pinatubo destroys the same quantity of ozone as a molecule of fluorocarbons.
- The author have stated already that the amount is cumulatively too large. So breaking to molecualr level is not required.

C. The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much higher than the quantity of fluorocarbons produced by the companies
- Again a stated fact in the premise. Not an assumption.

D. The molecular structure of ozone-depleting chemicals released during a volcanic eruption does not prevent them from reaching the stratosphere, the layer of the atmosphere where the ozone layer resides.
- Correct. If this becomes true, then the author claim doesn't hold valid. The conclusion is: human shoots only once, but since nature explodes a bomb - nature is the culprit. This option eliminates the possibility that the bomb misses the target.

E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released.
- The author says nature is responsible. And the nature wins both in rate and quantity. So it is not relevant to compare whether rate is important or quanity.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 09:49
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Well IMO D is the right answer , but in hindsight i fear that it is tempting.
I ll present my logic on selecting D.
Conclusion: Man made chemicals cannot be held responsible for ozone depletion.
Premise : Volcanic eruption has ozone depleting substance and its presence after eruption is much larger in quantity than the man made chemicals.

Prethinking Assumption: Its analogy that substantiates the conclusion. Hence Assumption should be more driven to establish the soundness of analogy.
Therefore, Something that justifies that both man made chemicals and volcanic eruption both are equal in their properties, when it comes to the destruction of the ozone layer.
or Something that establishes a similarity between man made chemicals and volcanic eruption chemicals.....

I do not think E is the right answer as it discusses about the rate is discussed , which is not more important.
I think If D is negated than conclusion cannot stand also it presents a dissimilarity between the two.

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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 09:56
SravnaTestPrep wrote:
Dinesh2Apr wrote:
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released. - this option states that rate is not as important as quantity, if we negate this option then it becomes rate is as important as quantity does this break the conclusion ? no, because we do not know whose rate is higher volcano or man made, if man made chemicals rate is higher then the conclusion breaks but if volcanos rate is higher then the conclusion is reinforced because in this situation both the rate and quantity of volcano is higher than man made.

Dear Dinesh2Apr,

It does not matter whether the rate of chemicals released in a volcanic eruption is greater or not. The point is that there is another factor than quantity of chemicals released that may determine how much of ozone is destroyed. Think of it this way. Instead of calling it as rate of release call it as another factor. So the choice would say that there are no other factors than quantity that determines how much of ozone is destroyed. Thus we can see that the author's conclusion would hold absolutely only when quantity is the only factor that determines how much of ozone is destroyed. If there are other factors his argument is not air tight. That is the conclusion would not logically follow from the premise.

Hi SravnaTestPrep,

Lets take rate to mean any other factor, so if Quantity is more important than any other factor then yes the authors conclusion will hold valid that nature is more responsible than man made.
Lets negate this assumption, some other factor is at least as important as quantity, now do we have any information on comparison of the other factor between nature and man made. No.
In this case there is still scope for the authors conclusion to hold ground, if the other factor has comparable effect between nature vs man made then the deciding factor will be quantity alone and Nature will win. Thus we can see that even after negating the assumption the conclusion does not break down.

For me this option choice is a good strengthener but option D stands out as an assumption

I might be wrong but like the discussion that is happening.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 11:13
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Dear Dinesh2Apr,

An assumption is something which makes the conclusion valid given the premise. Now let us state the premise, assumption and conclusion

Premise: the quantity of ozone depleting chemicals released determines how much of ozone is destroyed

Assumption: the rate of release of ozone depleting chemicals may or may not be more in a volcanic eruption and is more important than the quantity of chemicals released

Now does the conclusion that the chemicals released in a volcanic eruption destroys ozone more, follow from the above? It does not. It is not necessary that the argument totally break down. It is enough if the argument does not logically follow from the premise and the assumption. That is if you do not make the assumption the conclusion will not logically follow.That itself implies that the argument has broken down.

The problem with D is that it is not in any way related to the author's argument. The author never talks of molecular structure of the chemicals. An assumption is something that links the premise and the conclusion. So for the premise that quantity released determines how much of ozone is destroyed, the logical assumption is that there are no other factors that are more important than the quantity released. So we see choice D is totally out of place given the premise. In my opinion you cannot assume more than is warranted by the argument.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 11:35
Expert's post

Thanks
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 11:58
Consider this:

Premise: Socrates is a human
Conclusion: Socrates is intelligent

What is the assumption here for you to reach the conclusion that Socrates is intelligent? The assumption should be Humans are intelligent. So the assumption is based on the premise and the conclusion. It links the two. Any extraneous information should not be considered as assumption because we figure out the assumption based on the argument. For example you cannot say that "Humans who are not beautiful are intelligent and Socrates is not beautiful" is an assumption, though the conclusion would logically follow. This is because the argument doesn't warrant that information.

That is the reason choice D does not fit as an assumption for this question.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 12:31
+1 for D. If we negate this, the conclusion falls apart.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  04 Feb 2013, 20:17
Mount Pinatubo in the Philippines spewed forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history.

The passage clearly compares the amount of chemicals released in the eruption with the amount that industries spew.

Clearly the pre-thinking is that the chemicals released during the process has to have the same impact on ozone layer. Only then the comparison is possible.

I was confused between option B and E. I chose B but in retrospect option E sounds better.
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  05 Feb 2013, 01:26
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As per my understanding:

The argument says that if mankind cannot produce enough depleting chemicals to match those produced by the volcanic eruption (already in place) in 4 billion years. How can it be held responsible for depleting the ozone layer.

An assumption must hold true for the conclusion to be valid.

The popular view is that Ozone layer’s depletion is real, as certain as Neil Armstrong's landing on the moon. While that may be the case, the attribution of such depletion to man-made chemicals is not true. Mount Pinatubo in the Philippines spewed forth more than a thousand times the amount of ozone-depleting chemicals in one volcanic eruption than all the fluorocarbons manufactured by wicked, diabolical and insensitive corporations in history. Mankind can't possibly equal the output of even one eruption from Pinatubo, much less 4 billion years' worth of them, so how can it be held responsible for destroying ozone.

Which of the following is an assumption on which the argument of the author depends?

A. It would take mankind more than 4 billion years to destroy Ozone.

Irrelevant. Even if it took mankind more than 4 billion years to destroy ozone, the volcanic eruptions would be blamed first for the eruption.

B. Each molecule of ozone depleting chemical released during an eruption of Mount Pinatubo destroys the same quantity of ozone as a molecule of fluorocarbons.

Out of scope as the question is between the source of depletion and not how much depletion is caused.

C. The amount of ozone-depleting chemicals released during a single eruption in Mount Pinatubo is much higher than the quantity of fluorocarbons produced by the companies

D. The molecular structure of ozone-depleting chemicals released during a volcanic eruption does not prevent them from reaching the stratosphere, the layer of the atmosphere where the ozone layer resides.

If this point is negated the argument fails as the comparison between chemicals released during volcanic eruptions and industrial chemicals would be void.

E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released.

Out of scope
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Re: The popular view is that Ozone layer’s depletion-"Tough one" [#permalink]  05 Feb 2013, 01:39
SravnaTestPrep wrote:
Dinesh2Apr wrote:
E. The rate at which an ozone depleting chemical, whether man-made or released in a volcanic eruption, is released is not more important in the destruction of ozone layer than the quantity of chemicals released. - this option states that rate is not as important as quantity, if we negate this option then it becomes rate is as important as quantity does this break the conclusion ? no, because we do not know whose rate is higher volcano or man made, if man made chemicals rate is higher then the conclusion breaks but if volcano`s rate is higher then the conclusion is reinforced because in this situation both the rate and quantity of volcano is higher than man made.

Dear Dinesh2Apr,

It does not matter whether the rate of chemicals released in a volcanic eruption is greater or not. The point is that there is another factor than quantity of chemicals released that may determine how much of ozone is destroyed. Think of it this way. Instead of calling it as rate of release call it as another factor. So the choice would say that there are no other factors than quantity that determines how much of ozone is destroyed. Thus we can see that the author's conclusion would hold absolutely only when quantity is the only factor that determines how much of ozone is destroyed. If there are other factors his argument is not air tight. That is the conclusion would not logically follow from the premise.

Hi,

In my view the argument compares between source of depletion. Not about the quantitiy of depletion.
Re: The popular view is that Ozone layer’s depletion-"Tough one"   [#permalink] 05 Feb 2013, 01:39

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