The Earth s rivers constantly carry dissolved salts into its : GMAT Critical Reasoning (CR)
Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 27 Feb 2017, 14:57

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# The Earth s rivers constantly carry dissolved salts into its

Author Message
TAGS:

### Hide Tags

Manager
Joined: 22 May 2005
Posts: 139
Followers: 1

Kudos [?]: 14 [0], given: 0

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

### Show Tags

14 Jul 2005, 15:19
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

The Earthâ€™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 Earthâ€™s oceans can be accurately estimated.

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

1)The quantities of dissolved salts deposited by rivers in the Earthâ€™s oceans have not been unusually large during the past hundred years.
2)At any given time, all the Earthâ€™s rivers have about the same salt levels.
3)There are salts that leach into the Earthâ€™s oceans directly from the ocean floor.
4)There is no method superior to that based on salt levels for estimating the maximum age of the Earthâ€™s oceans.
5)None of the salts carried into the Earthâ€™s oceans by rivers are used up by biological activity in the oceans
If you have any questions
New!
Director
Joined: 18 Feb 2005
Posts: 673
Followers: 1

Kudos [?]: 6 [0], given: 0

### Show Tags

14 Jul 2005, 18:06
B and E are the best options and it could be B.....
SVP
Joined: 05 Apr 2005
Posts: 1731
Followers: 5

Kudos [?]: 76 [0], given: 0

Re: I like this CR... [#permalink]

### Show Tags

14 Jul 2005, 18:46
B. if the level of salt deposits every year is constatnt, then only the age of the ocen can be determined. so B is correct.
Senior Manager
Joined: 14 Jul 2005
Posts: 402
Followers: 1

Kudos [?]: 27 [0], given: 0

### Show Tags

14 Jul 2005, 22:44
E. the assumption assumes that all salts accumulated are always present and are never consumed....
Intern
Joined: 07 May 2005
Posts: 12
Location: Pune
Followers: 0

Kudos [?]: 0 [0], given: 0

### Show Tags

15 Jul 2005, 07:10
In my opinion A

If we negate this assumption then our conclusion to calculate the age of the oceans will not hold.

Vik
Manager
Joined: 22 May 2005
Posts: 139
Followers: 1

Kudos [?]: 14 [0], given: 0

### Show Tags

15 Jul 2005, 07:31
There've been a lot of fight over A and E...

A is preferrable though...

Reason??

Cos E might be happening for years [ decades before] so it balances out
Senior Manager
Joined: 17 Apr 2005
Posts: 375
Location: India
Followers: 1

Kudos [?]: 27 [0], given: 0

### Show Tags

15 Jul 2005, 08:09
This has been discussed earlier.
Consensus was A.

HMTG.
Director
Joined: 11 Mar 2005
Posts: 725
Followers: 2

Kudos [?]: 65 [0], given: 0

### Show Tags

15 Jul 2005, 08:33
E can be easily taken OUT

E says, biological reactions chew up a small portion of the salt. If that is the case, it has been probably happening every year with no exception.

B says about rivers. We dont care about rivers. We care about the collected water in the ocean. If the salt content changes in rivers, there would be cases when one river has more salt and other has less.

C is out of scope.

D is wrong too.

A is best. If the oceans had unusual fluctulations in last century, garbage in - garbage out. All the calculations will be wrong.
Intern
Joined: 13 Jul 2005
Posts: 47
Followers: 1

Kudos [?]: 0 [0], given: 0

### Show Tags

15 Jul 2005, 09:38
I believe A is the right answer?
Manager
Joined: 22 May 2005
Posts: 139
Followers: 1

Kudos [?]: 14 [0], given: 0

### Show Tags

16 Jul 2005, 13:08
Yup..Jerry, OA is A
16 Jul 2005, 13:08
Similar topics Replies Last post
Similar
Topics:
152 The Earth s rivers constantly carry dissolved salts into its 78 14 Aug 2008, 22:45
5 The Earth s rivers constantly carry dissolved salts into its 28 19 Jun 2008, 10:44
1 The Earth s rivers constantly carry dissolved salts into its 22 02 Apr 2008, 17:50
2 The Earth's rivers constantly carry dissolved salts into its 20 06 Jan 2008, 16:04
The Earth s rivers constantly carry dissolved salts into its 12 20 Dec 2007, 15:47
Display posts from previous: Sort by