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The Earth s rivers constantly carry dissolved salts into its

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The Earth s rivers constantly carry dissolved salts into its [#permalink] New post 23 Nov 2005, 18:10
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The Earth’s rivers constantly carry dissolved salts into its oceans. Clearly, therefore, by taking the resulting increase in salt levels in the oceans over the past hundred years and then determining how many centuries of such increases it would have taken the oceans to reach current salt levels from a hypothetical initial salt-free state, the maximum age of the Earth’s oceans can be accurately estimated.

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

A. The quantities of dissolved salts deposited by rivers in the Earth’s oceans have not been unusually large during the past hundred years.

B. At any given time, all the Earth’s rivers have about the same salt levels.

C. There are salts that leach into the Earth’s oceans directly from the ocean floor.

D. There is no method superior to that based on salt levels for estimating the maximum age of the Earth’s oceans.

E. None of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans.
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 [#permalink] New post 23 Nov 2005, 18:17
B, D, and E all use extreme language. C is out of scope.

(A) by POE.
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 [#permalink] New post 23 Nov 2005, 18:22
Chose A as well.

D, E too extreme. B, C out of scope
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 [#permalink] New post 23 Nov 2005, 18:27
Premise:
- Earth's river constantly carry dissovled salts to ocean

Conclusion:
- resulting increasein salt levels in oceans over past 100 yrs + determination of how many centuries such increase is needed to reach salt levels from initial salt-free state -> provide max age of earth's oceans

Go with E. The passage assumes that the salt level will build up over time, without it being loss to any means.
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 [#permalink] New post 24 Nov 2005, 22:58
Using POE.

A - Correct.
B - How does it matter.
C - Weakens the argument.
D - We are not talking of methods
E - Cannot be assumed.

I vote for A.
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 [#permalink] New post 25 Nov 2005, 03:46
ywilfred wrote:
Premise:
- Earth's river constantly carry dissovled salts to ocean

Conclusion:
- resulting increasein salt levels in oceans over past 100 yrs + determination of how many centuries such increase is needed to reach salt levels from initial salt-free state -> provide max age of earth's oceans

Go with E. The passage assumes that the salt level will build up over time, without it being loss to any means.


I agree with you :wink:
IMO, extreme assumption is acceptable ...only the conclusion can't be extreme.
In scientific calculation/estimation, they often assume the perfect/absolute cases! For example, in microeconomics, to develop theories, economists always assume in a perfectly competitive market.

I would go for E. Coz anyway, I can't figure out how A could affect the calculation. Or i must miss sth here, hope someone enlighten me :idea:
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 [#permalink] New post 25 Nov 2005, 03:59
A. The quantities of dissolved salts deposited by rivers in the Earth’s oceans have not been unusually large during the past hundred years-----> does it mean the amount of salt dissolved into oceans remain constant over years???
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 [#permalink] New post 25 Nov 2005, 06:01
A)..."unusually" in A) is the keyword, because the scientists who make the calc assume that the quantities are as high as usual.
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 [#permalink] New post 25 Nov 2005, 06:07
laxieqv wrote:
A. The quantities of dissolved salts deposited by rivers in the Earth’s oceans have not been unusually large during the past hundred years-----> does it mean the amount of salt dissolved into oceans remain constant over years???


yes but u have to negate it to attack the conclusion...
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Re: CR - Earth's rivers [#permalink] New post 25 Nov 2005, 11:28
I was stuck between A and E, and finally choose A. Even if E were the case one could gauge the age of the Earth's oceans if you now that irregularity. However if A is not an ssumption, you can not draw a conclusion.
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 [#permalink] New post 25 Nov 2005, 14:26
I will go with E.
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 [#permalink] New post 25 Nov 2005, 15:44
christoph wrote:
A)..."unusually" in A) is the keyword, because the scientists who make the calc assume that the quantities are as high as usual.


you gottit! :wink: . You're such a great CR cracker, I have not seen any of your posts get wrong ^_~
  [#permalink] 25 Nov 2005, 15:44
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