Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 25 Sep 2016, 01:56

### 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

# Water vapor evaporated from the ocean contains a greater

Author Message
TAGS:

### Hide Tags

SVP
Joined: 16 Jul 2009
Posts: 1629
Schools: CBS
WE 1: 4 years (Consulting)
Followers: 40

Kudos [?]: 930 [1] , given: 2

Water vapor evaporated from the ocean contains a greater [#permalink]

### Show Tags

16 Jun 2010, 14:35
1
KUDOS
4
This post was
BOOKMARKED
00:00

Difficulty:

75% (hard)

Question Stats:

51% (02:45) correct 49% (02:13) wrong based on 422 sessions

### HideShow timer Statistics

Water vapor evaporated from the ocean contains a greater proportion of oxygen-16 and a smaller proportion of the heavier oxygen-18 than does seawater. Normally, this phenomenon has no effect on the overall composition of the ocean, because evaporated seawater returns to the ocean through precipitation. During an ice age, however, a large amount of precipitation falls on ice caps, where it is trapped as ice.

Which one of the following conclusions about a typical ice age is most strongly supported by the statements above?

(A) The proportions of oxygen-16 and oxygen-18 are the same in vapor from seawater as in the seawater itself.
(B) The concentration of oxygen-18 in seawater is increased.
(C) Rain and snow contain relatively more oxygen-16 than they do in interglacial periods.
(D) During the ice age, more of the Earth’s precipitation falls over land than falls over the ocean.
(E) The composition of seawater changes more slowly than it does in interglacial periods.

Source :Lsat
[Reveal] Spoiler: OA

_________________

The sky is the limit
800 is the limit

GMAT Club Premium Membership - big benefits and savings

Senior Manager
Affiliations: SPG
Joined: 15 Nov 2006
Posts: 327
Followers: 14

Kudos [?]: 653 [3] , given: 20

### Show Tags

16 Jun 2010, 15:01
3
KUDOS

Premise: no effect on the overall composition of the ocean, because evaporated seawater returns to the ocean through precipitation
Premise: During an ice age, however, a large amount of precipitation falls on ice caps, where it is trapped as ice.

the premises tell us that although the overall composition of ocean does not change BUT during an ice age it does because a large portion of precipitation (more O-16) is trapped as ice on ice caps.

this must mean that the concentration of O-18 is now increased.

B is correct

_________________

press kudos, if you like the explanation, appreciate the effort or encourage people to respond.

Director
Status: Impossible is not a fact. It's an opinion. It's a dare. Impossible is nothing.
Affiliations: University of Chicago Booth School of Business
Joined: 26 Nov 2009
Posts: 997
Location: Singapore
Followers: 21

Kudos [?]: 682 [0], given: 36

### Show Tags

16 Jun 2010, 19:43
water vapor from ocean O16 > O18
water vapor from sea water O16 > O18---------->TRAP.
Water vapor evaporated from the ocean contains a greater proportion of oxygen-16 and a smaller proportion of the heavier oxygen-18 than does [water vapor from] seawater

(A) The proportions of oxygen-16 and oxygen-18 are the same in vapor from seawater as in the seawater itself. >> Out of scope / Cannot be inferred.
(B) The concentration of oxygen-18 in seawater is increased. >> O16 evaporates causing O18 to increase in seawater. O16 is not returned. Answer
(C) Rain and snow contain relatively more oxygen-16 than they do in interglacial periods. >> Rain is alright.But snow is wrong. OUT
(D) During the ice age, more of the Earth’s precipitation falls over land than falls over the ocean. >> Out of scope
(E) The composition of seawater changes more slowly than it does in interglacial periods. >> Out of scope
_________________

Please press kudos if you like my post.

Director
Status: Impossible is not a fact. It's an opinion. It's a dare. Impossible is nothing.
Affiliations: University of Chicago Booth School of Business
Joined: 26 Nov 2009
Posts: 997
Location: Singapore
Followers: 21

Kudos [?]: 682 [0], given: 36

### Show Tags

16 Jun 2010, 22:58
Hey All

Now a question -

"Water vapor evaporated from the ocean contains a greater proportion of oxygen-16 and a smaller proportion of the heavier oxygen-18 than does seawater."

It means water vapor from ocean has O16 > O18 obviously
But the second half.

Is it comparing water vapor 's concentration from ocean with sea water ?

or is it comparing water vapor from ocean w/ water vapor from sea water ?

Can some one answer this pls?
_________________

Please press kudos if you like my post.

Senior Manager
Affiliations: SPG
Joined: 15 Nov 2006
Posts: 327
Followers: 14

Kudos [?]: 653 [1] , given: 20

### Show Tags

17 Jun 2010, 10:29
1
KUDOS
nusmavrik wrote:

Is it comparing water vapor 's concentration from ocean with sea water ?

or is it comparing water vapor from ocean w/ water vapor from sea water ?

Can some one answer this pls?

critical thinking

actually this is a comparison of composition ... between water vapor (of the ocean) and seawater

e.g. let's assume
water vapor (from the ocean): 75% O-16, 25% O-18
seawater: 65% O-16, 35% O-18

now the argument is comparing the oxygen concentration between the two.
i.e. water vapor (from the ocean) has greater composition of O-16 than does saltwater -----> equal amount of seawater btw

i hope i made some sense!

_________________

press kudos, if you like the explanation, appreciate the effort or encourage people to respond.

Director
Status: Impossible is not a fact. It's an opinion. It's a dare. Impossible is nothing.
Affiliations: University of Chicago Booth School of Business
Joined: 26 Nov 2009
Posts: 997
Location: Singapore
Followers: 21

Kudos [?]: 682 [0], given: 36

### Show Tags

17 Jun 2010, 11:38
LOL dimitri92. I was inferring too less. A is negative.

+1 to you
SVP
Joined: 17 Feb 2010
Posts: 1558
Followers: 18

Kudos [?]: 513 [0], given: 6

### Show Tags

23 Jun 2010, 19:24
B for me for the reasons explained above.
Manager
Joined: 08 Oct 2010
Posts: 213
Location: Uzbekistan
Schools: Johnson, Fuqua, Simon, Mendoza
WE 3: 10
Followers: 9

Kudos [?]: 588 [0], given: 974

### Show Tags

14 Feb 2011, 00:03
dimitri92 wrote:

Premise: no effect on the overall composition of the ocean, because evaporated seawater returns to the ocean through precipitation
Premise: During an ice age, however, a large amount of precipitation falls on ice caps, where it is trapped as ice.

the premises tell us that although the overall composition of ocean does not change BUT during an ice age it does because a large portion of precipitation (more O-16) is trapped as ice on ice caps.

this must mean that the concentration of O-18 is now increased.

B is correct

Your explanation is acceptable with regard to the OA.

But I think, the text is a bit confusing to find the right answer. A, C, D, E are clearly out.

And let's consider the OA in the light of the main text.

The first premise is "Water vapor evaporated from the ocean contains a greater proportion of oxygen-16 and a smaller proportion of the heavier oxygen-18 than does seawater."
This premise separates the seawater from the ocean water. On this basis the second premise - "Normally, this phenomenon has no effect on the overall composition of the ocean, because evaporated seawater returns to the ocean through precipitation." - seems clearly ambiguous because of the use of the word "return".

Moreover, one may, because of the words " precipitation falls on ice caps", assume two cases, i.e. either water circulation from the ocean to the sea or vise versa. Herewith the reader can also be trapped in so far as the ocean water does usually not become icy (here the ice age is not an absolute evidence to disprove this fact and otherwise as in the GMAT-format the test-taker is not assumed to posses the knowledge of the special subject, as here the case relates to the geography), the same is true under conditions regarding the seawater.

Take my evaluations into consideration then even B is also not a proper ans. choice.

I would say it a bad question because of such internal contradictions in its construction and ambuqity of its content.
Current Student
Joined: 14 Dec 2010
Posts: 218
Location: India
Concentration: Technology, Entrepreneurship
GMAT 1: 680 Q44 V39
Followers: 2

Kudos [?]: 34 [0], given: 5

### Show Tags

14 Feb 2011, 00:38
B it is. I think i have seen this question on the OG.
Manager
Joined: 08 Dec 2010
Posts: 214
WE 1: 4 yr IT
Followers: 3

Kudos [?]: 54 [0], given: 26

### Show Tags

14 Feb 2011, 10:56
i'll go with B. explanations given above sum it up
_________________

this time, we play for keeps

Manager
Joined: 27 Oct 2010
Posts: 189
Followers: 1

Kudos [?]: 10 [0], given: 20

### Show Tags

14 Feb 2011, 11:42
B. If more oxygen-16 gets evaporated from the ocean than oxygen-18 and the ocean does not get replinished with majority of them, then the concentration of oxygen-18 increases in the ocean.
Manager
Joined: 22 Jan 2013
Posts: 62
Followers: 0

Kudos [?]: 27 [0], given: 28

### Show Tags

30 Jan 2014, 09:31
dimitri92 wrote:
nusmavrik wrote:

Is it comparing water vapor 's concentration from ocean with sea water ?

or is it comparing water vapor from ocean w/ water vapor from sea water ?

Can some one answer this pls?

critical thinking

actually this is a comparison of composition ... between water vapor (of the ocean) and seawater

e.g. let's assume
water vapor (from the ocean): 75% O-16, 25% O-18
seawater: 65% O-16, 35% O-18

now the argument is comparing the oxygen concentration between the two.
i.e. water vapor (from the ocean) has greater composition of O-16 than does saltwater -----> equal amount of seawater btw

i hope i made some sense!

Can somebody please eloborate on this. im still confused
GMAT Club Legend
Joined: 01 Oct 2013
Posts: 9759
Followers: 837

Kudos [?]: 173 [0], given: 0

Re: Water vapor evaporated from the ocean contains a greater [#permalink]

### Show Tags

12 Aug 2015, 02:50
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
Re: Water vapor evaporated from the ocean contains a greater   [#permalink] 12 Aug 2015, 02:50
Similar topics Replies Last post
Similar
Topics:
1 If deep-sea divers ascend too rapidly from ocean depths 2 02 Jun 2016, 11:54
5 Ocean waves 4 24 May 2015, 00:24
15 Plastic beverage containers manufactured from 12 18 Sep 2013, 13:48
Leaching, the recovery of copper from the drainage water of 3 08 Sep 2010, 15:54
23 From 1978 to 1988, beverage containers accounted for a 19 06 Oct 2007, 13:55
Display posts from previous: Sort by