LR help: PT 1 Section 3 #11

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cocoabutta32

Posts: 6
Joined: Wed Apr 07, 2010 11:33 pm

LR help: PT 1 Section 3 #11

If anyone could help me understand why B must logically follow from the stimulus I would really appreciate it. The answer seems to imply that ocean water is evaporated and falls into the sea, where the stimulus only says that seawater evaporates and falls into the ocean. Am I missing something, because it doesn't seem like an assumption I should make?

kckool7

Posts: 139
Joined: Mon Mar 26, 2012 3:32 pm

Re: LR help: PT 1 Section 3 #11

Haha, just took this section like 20 minutes ago.

The water vapor contains a higher percentage of O16 as opposed to O18 than the ocean as a whole. This normally cancels out because water vapor cycles back into the ocean. HOWEVER, during an ice age, the water doesn't cycle back in because it gets stuck in an iceberg. Therefore, the high percentage 016 is leaving and not being replaced, leaving relatively more O18. Hope that helps, if not I can try to explain it in a different way.

If you could give me a bit of help with 5, 10, 17 and 25 from that section, I'd appreciate it.

Br3v

Posts: 4272
Joined: Mon Jun 13, 2011 7:18 pm

Re: LR help: PT 1 Section 3 #11

kckool7 wrote:Haha, just took this section like 20 minutes ago.

The water vapor contains a higher percentage of O16 as opposed to O18 than the ocean as a whole. This normally cancels out because water vapor cycles back into the ocean. HOWEVER, during an ice age, the water doesn't cycle back in because it gets stuck in an iceberg. Therefore, the high percentage 016 is leaving and not being replaced, leaving relatively more O18. Hope that helps, if not I can try to explain it in a different way.

If you could give me a bit of help with 5, 10, 17 and 25 from that section, I'd appreciate it.

weird you guys were probably taking it during the same time

Manhattan LSAT Noah

Posts: 744
Joined: Tue Oct 12, 2010 8:43 am

Re: LR help: PT 1 Section 3 #11

kckool7 wrote:If you could give me a bit of help with 5, 10, 17 and 25 from that section, I'd appreciate it.

15 is discussed here.

cocoabutta32

Posts: 6
Joined: Wed Apr 07, 2010 11:33 pm

Re: LR help: PT 1 Section 3 #11

Well I think I figured out that my problem was thinking there was a distinction being made between sea water and ocean water. I should have realized this wasn't the case when it said "evaporated seawater returns to the ocean". Thanks for your response kck, it clicked right after reading it. As for your questions, I didnt do that section since I was just doing most strongly supported questions, but I can take a look and see if I can't help in a few hours.