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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 16 Oct 2006, 20:51
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C
D
E

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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 16 Oct 2006, 20:56
Straight A. 23 seconds. If salt in the last 100 years is exceptionally high, then the methodology described to figure out the age of the ocean will be skewed.
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Re: CR - Earth River [#permalink] New post 16 Oct 2006, 21:11
KC 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.


E

negate E...

if the salts are used up by biological/other activity , then the age of ocean cannot be determined
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 [#permalink] New post 16 Oct 2006, 22:59
Straight E.
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 [#permalink] New post 17 Oct 2006, 03:37
I find D and E very Close.
will go with D
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Re: CR - Earth River [#permalink] New post 17 Oct 2006, 04:57
KC 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.

Seems right.

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

we are concerned about what earth's rivers carry to sea, not what the rivers have.

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

That can happen even in the last 100 years. That factor is constant. We dont need to worry. C is out.

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

We dont need to bother about the validity of method. Author is using that method. Thats it.

E. None of the salts carried into the Earth’s oceans by rivers are used up by biological activity in the oceans.

Just like in C, that factor is constant. E is out

:wink:
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 [#permalink] New post 17 Oct 2006, 05:12
I also think the answer should be E. I think in these type of questions (assumptions) we need to find a factor that is not mentioned (i.e salt being used for biological purposes).

What is the OA/OE please?
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 [#permalink] New post 17 Oct 2006, 05:59
Am I wrong here?

I think the question should read something like, "All of the following statements are assumptions EXCEPT"

They all sound good, D to a lesser degree and C is not a strong assumption.
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 [#permalink] New post 17 Oct 2006, 08:28
OA is E.

Unfortunately, I don't have OE.

Though I can't tell you the source, but it will be very useful for you guys.

=)
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 [#permalink] New post 17 Oct 2006, 13:23
Late but sure E .
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 [#permalink] New post 17 Oct 2006, 16:27
E..

I thought D might be the choice at first, but then I realized it was irrelavent

The argument assumes the method is an accurate model, but that doesn't neccisarily mean there is or there is not a 'superior' method out there..
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 [#permalink] New post 17 Oct 2006, 17:49
E is better than A
  [#permalink] 17 Oct 2006, 17:49
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