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# Most of the world's supply of uranium currently comes from

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Re: Most of the world's supply of uranium currently comes from [#permalink]

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22 Jan 2012, 21:23
vksunder wrote:
Guys, I havent really started studying CR and this is the first time I've come across a question stem like the one mentioned here.

Which of the following would it be most useful to determine in evaluating the argument? -- Does this mean weaken/undermine the argument in this question??

www.gmatprepnow.com

They have all the lesson modules of CR, RC and SC are free. Atleast you ll get an idea what you are heading into in Verbal Section.
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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22 Jan 2012, 21:33
debaranjansahoo wrote:

They have all the lesson modules of CR, RC and SC are free. Atleast you ll get an idea what you are heading into in Verbal Section.

Thanks man for sharing the link. But when I clicked on a module, no video is coming up. Need to verify on a different computer.
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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27 Jul 2013, 02:24
i can't understand why A is the answer.. i would choose this option only in a "weaken question", but this is an "evaluation question"; my kaplan book says: "The correct answer won't strengthen or weaken the author's reasoning or supply a missing assumption. Instead, the right answer will specify the kind of evidence that you would help you to judge the validity of the author's argument"
this is the reason why i'd chose C
can someone helps me?
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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27 Jul 2013, 02:54
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lucasITA wrote:
i can't understand why A is the answer.. i would choose this option only in a "weaken question", but this is an "evaluation question"; my kaplan book says: "The correct answer won't strengthen or weaken the author's reasoning or supply a missing assumption. Instead, the right answer will specify the kind of evidence that you would help you to judge the validity of the author's argument"
this is the reason why i'd chose C
can someone helps me?

We want to evaluate this:

Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

Which of the following would it be most useful to determine in evaluating the argument?

a. Whether the uranium in deposits on land is rapidly being depleted
This is the correct answer. If the deposits on land are rapidly being depleted, the uranium's price is going to be higher so despite the high costs, the method of obtaining uranium will be commercially viable.

c. Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
I) show promise of reduce != will reduce
II) determining the possible existence of such technologies does not help us in evaluating the argument
(...) until the cost of extracting uranium from seawater can somehow be reduced (...) <== it has no effect on this
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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03 Sep 2013, 06:55
icandy wrote:
Seems to be A for the reasons mentioned above.

rapid depletion on land will make the extraction from seawater a necessity and hence commercially viable.

I agree that rapid depletion on land will make the extraction from seawater a necessity, but how it makes it commercially viable then ?

Thanks
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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04 Sep 2013, 00:24
gmat blows wrote:
Most of the world's supply of uranium currently comes from the mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that Uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

Which of the following would it be most useful to determine in evaluating the argument?

a. Whether the uranium in deposits on land is rapidly being depleted
b. Whether most uranium is used near where it is mined
c. Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
d. Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land
e. Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater.

From the list of options, I left myself with A and C. What made (A) not an answer for me was the face that the question asked about commercial viability. If uranium deposits on land deplete themselves, we will have to start extracting from seawater. This doesn't address costs at all, so I chose (C).
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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04 Jun 2014, 10:48
A nice question and good explanation by Zarrolou (3 posts above).
Bumping it up.
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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24 Sep 2014, 01:39
D would have been right if it was mentioned that amount of uranium per unit of seawater is higher that amount of uranium per unit of land
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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05 Mar 2015, 05:53
Before everything, let's break down the prompt into pieces
• Uranium mostly come from mines. An alternative source would be from seawater, but it is too costly.
• Argument: Cost of extracting uranium from seawater should decrease to consider this option.

(A) Whether the uranium in deposits on land is rapidly being depleted
- Correct answer. It is important to know whether mining uranium will still be a viable option or not. If it is rapidly depleting, obtaining uranium from seawater will be the ONLY viable option. If it is not rapidly depleting, then it is not a viable option.
(B) Whether most uranium is used near where it is mined
- This is irrelevant to the argument, as this does not address whether extracting uranium in seawater could be an option
(C) Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
- This is future-driven. If there are technological advances that show promise of reducing the cost, it still does not make uranium extraction from seawater a viable option for now.
(D) Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land
- Irrelevant. What is important is the costly process of extraction, and not necessarily the total amount of uranium that can be extracted
(E) Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater.
- The question is whether it will be better to extract uranium in the mines or from seawater. And if it is too costly to extract from seawater, it would be efficient to extract from mines. This does not make extracting from seawater a viable option for now.
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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19 Nov 2015, 15:54
I will take C, as because viability will be proved if

i) cost of fetching gets reduced and/or
ii) Market price goes up by any means, to make up for the high cost of fetching.

the conclusion tells us to consider case i), i.e until the cost of fetching is reduced.

Only C mentions sth about reducing the cost of fetching.
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Most of the world's supply of uranium currently comes from [#permalink]

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30 Jan 2016, 14:06
Chembeti wrote:

If I were a VC and need to start doing the business of extracting uranium from sea water, I will go with A because that is the shortest way to determine the success of my venture. Sure, C also helps, but it takes time. And the question is about 'most useful', hence A wins over C.

I chose C because of the adverb "commercially"
A is very right but it concerns the feasibility of the plan not commercial impact (maybe for long term, yes)
Thank you.
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Most of the world's supply of uranium currently comes from [#permalink]

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16 May 2016, 13:29
Argument: If cost of extracting Uranium from seawater is not reduced , then this method is not commercially viable
i.e. if this method is to be commercially viable, then cost of extraction must be reduced.

To evaluate this argument, we need to check whether the cost of extraction really needs to be reduced or can something else make this method commercially viable?

A. if Land deposits decrease rapidly, then we can expect price of Uranium to go up--making uranium extraction from sea water commercially viable.
If not price will keep steady, not making seawater Ur extraction commerically viable until cost can be reduced.
B. irrelevant
C. asks whether cost can be reduced but that is not what the argument is about.
yes there are tech to reduce cost, good -argument still stands
no, there are no tech to reduce cost, ok but you still need to reduce cost- argument still stands.
D.Yes , there significant seawater Ur deposits compared to land deposits, what about cost of extraction? cant say!
No, there are no significant Ur deposits compared to land deposits. ok, still to extract this small deposits commerically- you still need to reduce cost- argument still stands.
E. irrelevant.
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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21 Jan 2017, 23:28
I got confused between the mine deposits and land deposits. How can we consider the both as same?
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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07 Feb 2017, 23:19
MaMa77 wrote:
I got confused between the mine deposits and land deposits. How can we consider the both as same?

Mine deposits = land deposits, and in the case they were not the same, choice D would be irrelevant anyways.
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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28 Feb 2017, 08:35
gmat blows wrote:
Most of the world's supply of uranium currently comes from the mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that Uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

Which of the following would it be most useful to determine in evaluating the argument?

a. Whether the uranium in deposits on land is rapidly being depleted
b. Whether most uranium is used near where it is mined
c. Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
d. Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land
e. Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater.

[Reveal] Spoiler:
-----
I was able to narrow down to A, C, and D
Ive convinced myself that 'technological advaces' to reduce cost was slighltly a shift of scope.
now, between A and D. I feel that they are almost synonymous in meaning. It would be important to know whether the uranium is being depleted (if not, then extracting from seawater is not needed). However, doesnt D) somewhat imply the same thing? If there isnt alot of uranium in the seawater to begin with, then the even the reduction in cost would not be worth it?

thanks.

This is a great question and I just want to add my two cents to clarify the difference between A & C. I picked A first and then started thinking about C which also makes a lot of sense. But here's my reasoning for why C is definitely wrong.

A) Correct answer because, if land deposits are running out in 10 years then extracting from seawater becomes a necessity. At that point think about supply and demand, when the supply decreases, demand increases and the price goes up. Therefore at some point it becomes commercially viable. Now think about OIL, when the price of oil is $40 a barrel, it becomes commercially unprofitable to dig oil out of Alberta's tar sands, so companies stop extracting it. But when the price goes up, they start extracting because it becomes commercials viable. Demand has a huge impact on the price. Now imagine if all the Oil in the world ran out and we found oil on the Moon, would it become commercially viable to go to the moon? Yes, people would start going to the Moon to get oil. So think about that. For C) many people are stuck with this option, I also thought this might be correct BUT, think about the supply. IF the supply of land uranium is unlimited, it will never run out, so even if there's new technology then that technology might make it cheaper to extract from land. (There is a lot of uncertainty). So think in terms of extremes, unlimited resources on land, therefore we may never have to extract from water, even if it becomes cheaper than it was before. Say Extracting from land =$1, and extracting from water = $10, even if the cost of extracting from water comes down to$5 with new technology, its still cheaper to get it from Land. So without knowing the cost of each method and supply, we can't answer with C.

So the answer is A. Hope this helps!
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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06 Apr 2017, 18:58
Most of the world's supply of uranium currently comes from the mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that Uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

Which of the following would it be most useful to determine in evaluating the argument?

a. Whether the uranium in deposits on land is rapidly being depleted
b. Whether most uranium is used near where it is mined
c. Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
d. Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land
e. Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater.

My 2 cents.

Premise 1 : Most uranium comes from mines
Premise 2 : cost of extraction from sea > world market price
Conclusion : Unless cost goes down, extraction from sea is not viable --> which means, stick with mining from land.

I was between A and C and eliminated C because although it is tempting, technology is not mentioned in the stem.
A is correct because, if uranium from land is no longer possible due to depletion, then people will be forced to extract from sea, pushing the price up.
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Most of the world's supply of uranium currently comes from [#permalink]

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07 Apr 2017, 06:44
Nice explanation referring to premise and conclusion.
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Last edited by umadurga on 08 Apr 2017, 13:37, edited 1 time in total.
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Re: Most of the world's supply of uranium currently comes from [#permalink]

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07 Apr 2017, 07:33
Only choice A can be correct choice for evaluate question
Re: Most of the world's supply of uranium currently comes from   [#permalink] 07 Apr 2017, 07:33

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