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The Earth s rivers constantly carry dissolved salts into its

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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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New post 25 Aug 2012, 09:03
all the options look competitive here..

negation helps a lot..
this is a very good example to show the importance of technique
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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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New post 06 Sep 2012, 01:11
hibloom wrote:
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.



I am confused in B and E . Please clarify .
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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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New post 25 Sep 2013, 00:56
Option C is a standard trap in an assumption question.

The answer is just the opposite.

The assumption is that salt in ocean is only built through river deposits.

C would've been correct if it were - There are no salts that leach into the ocean directly from the ocean floor.
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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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New post 31 Mar 2014, 16:20
Lets see Why It must be A.

Here the issue is about the validity of scale, which is the level of salt, across various time period. And,here,the time period and the consistency of level in that time period only matter. Now all the factors, which are constantly effecting levels across all time periods will not hurt the consistency of salt levels as all these factors are active across the time period consistently.
As far as E is concern, though biological activities effect the level of salt, they do not hurt the consistency of salt levels across the time period ( for instance: they might reduce the level by x% but across all time period so no variation across levels in different time period).

negation of option A will create variation in the salt levels across different time period, creating an error into the method of measuring time period, accurately. Hence will collapse the argument.
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The Earth s rivers constantly carry dissolved salts into its [#permalink]

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New post 28 Jan 2015, 23:34
jainshruti64 wrote:
hibloom wrote:
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.



I am confused in B and E . Please clarify .


For anyone else confused about B and E, here's my take on these:

(B) At any given time, all the Earth’s rivers have about the same salt levels.
This talks about salt levels in rivers. I am not sure whether I'm technically right, but I figure salt levels is a per unit calculation. I feel, the salt level alone, without knowing the volume of water, cannot determine the total amount of salt in each river.
Example: River A is 10km long and river B is 50km long. Both have salt levels of 100, but I would think river B has more salt because its larger.
Hence salt levels would have no bearing.
(E) None of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans.
Even if some of the salts are used up, E does not say that the people measuring salt levels would be unaware of it. Hence it is possible that the ocean uses 10% of the salt it receives for a certain activity, and the people measuring salt levels already know about it, thus factoring for it in their calculations.
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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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New post 07 Feb 2015, 07:46
The argument proposes a method of oceans age calculation using the salt levels in oceans.
A - CORRECT.If yes, the method would be wrong to estimate the number of centuries it takes by taking the last century level as a representative amount. If not, the method can be right.
B - OOS. It's not deal with the salt level comparison among all rivers.
C - OOS.
D - OSS.
E - Whether this happens or not, it can be reflected in the ocean's annual salt level.
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Re: The Earth s rivers constantly carry dissolved salts into its [#permalink]

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New post 09 May 2015, 06:05
hibloom wrote:
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.



Between A and E.
Negate E.
Few of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans.
Still we can predict age.Only few salts are used,its not "most".
Re: The Earth s rivers constantly carry dissolved salts into its   [#permalink] 09 May 2015, 06:05

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