Last visit was: 13 Jul 2024, 12:04 It is currently 13 Jul 2024, 12:04
Close
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
Your Progress

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
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
SORT BY:
Date
Tags:
Show Tags
Hide Tags
User avatar
Director
Director
Joined: 04 Jan 2008
Posts: 517
Own Kudos [?]: 3913 [3]
Given Kudos: 17
Send PM
User avatar
Director
Director
Joined: 05 Jul 2008
Posts: 622
Own Kudos [?]: 1979 [0]
Given Kudos: 1
 Q49  V41
Send PM
User avatar
Director
Director
Joined: 04 Jan 2008
Posts: 517
Own Kudos [?]: 3913 [0]
Given Kudos: 17
Send PM
User avatar
Director
Director
Joined: 04 Jan 2008
Posts: 517
Own Kudos [?]: 3913 [0]
Given Kudos: 17
Send PM
Re: The molecules of carbon dioxide in the Earth’s atmosphere affect the h [#permalink]
Icandy,
you are perfect
I misread the "red underlined part"

19. According to the passage, atmospheric carbon dioxide performs all of the following functions EXCEPT:

(A) absorbing radiation at visible wavelengths
(B) absorbing infrared radiation
(C) absorbing outgoing radiation from the Earth
(D) helping to retain heat near the Earth’s surface
(E) helping to maintain a constant average temperature on the Earth’s surface
The Passage says:
"Although these molecules allow radiation at visible wavelengths, where most of the energy of sunlight is concentrated, to pass through, they absorb some of the longer-wavelength, infrared emissions radiated from the Earth’s surface, radiation that would otherwise be transmitted back into space. "
Director
Director
Joined: 16 Sep 2016
Status:It always seems impossible until it's done.
Posts: 641
Own Kudos [?]: 2133 [4]
Given Kudos: 174
GMAT 1: 740 Q50 V40
GMAT 2: 770 Q51 V42
Send PM
Re: The molecules of carbon dioxide in the Earth’s atmosphere affect the h [#permalink]
4
Kudos
4 mins 12 secs to all correct but the last question. SajjadAhmad, I feel the OA to Q7 should be D. Please look into it.

Summary: The passage begins with talking about the importance of CO2 in the atmosphere and goes on to warn about the probable negative effects of growing CO2 over the last hundred years. It then details how mathematical models help predict the average temperature rise with growing CO2 and further adds that one of these models assumes constant humidity. Also, towards the end, a positive loop is described where rising temperature leads to the melting of polar ice caps and loss of reflectivity of earth leading to even higher heat capture and more temperature.

Need to focus on the main point of the passage and not on the details used to convey it.
1. The primary purpose of the passage is to
(A) warn of the dangers of continued burning of fossil fuels Again, fossil fuels is indirectly the cause of the direct material being discussed i.e CO2
(B) discuss the significance of increasing the amount of carbon dioxide in the atmosphere Perfect - this is the heart of the content.
(C) explain how a constant temperature is maintained on the Earth’s surface This is just a detail used to show the importance of CO2 in the first paragraph
(D) describe the ways in which various atmospheric and climatic conditions contribute to the Earth’s weather Earth's weather is out of context and too broad we are only looking to talk about CO2 and average temperature.
(E) demonstrate the usefulness of mathematical models in predicting long-range climatic change Again, not the main point but a means to an end.

Direct detail question from the passage
2. According to the passage, the greatest part of the solar energy that reaches the Earth is
(A) concentrated in the infrared spectrum
(B) concentrated at visible wavelengths Perfect - mentioned in the passage
(C) absorbed by carbon dioxide molecules
(D) absorbed by atmospheric water vapor
(E) reflected back to space by snow and ice

EXCEPT type - so we are looking for the one option that does not fit or is incorrect
3. According to the passage, atmospheric carbon dioxide performs all of the following functions EXCEPT:
(A) absorbing radiation at visible wavelengths Perfect - it is said to only absorb the infrared wavelength
(B) absorbing infrared radiation Given in the passage
(C) absorbing outgoing radiation from the EarthMentioned - again infrared only
(D) helping to retain heat near the Earth’s surface Given - this is what the passage talks about!
(E) helping to maintain a constant average temperature on the Earth’s surface This is the end point of CO2 heat capture as per the first paragraph

Author's tone is to be judged by the key words the author uses and also need to look at the end of each paragraph to search for them in addition to the end of the passage
4. Which of the following best describes the author’s attitude toward the increasing amount of carbon dioxide in the atmosphere and its consequences?
(A) Incredulous Not even close!
(B) Completely detached The author does not show to be detached, infact is actively researching and quoting models etc. Wrong.
(C) Interested but skeptical Author is definitely interested but does not show skepticism
(D) Angry yet resigned Laughably incorrect
(E) Objective yet concerned Perfect - objective as the author uses math models to express the content and concern for the probable negative impact of the increase of CO2 on Human life

Direct application question. QUITE UNIQUE! The passage mentions a drop of 6 deg per km from the surface and that the surface is at a mean of 15 deg
5. It can be concluded from information contained in the passage that the average temperature at an altitude of 1 kilometer above the Earth is about
(A) 15℃
(B) 9℃ CORRECT
(C) 2.5℃
(D) -12℃
(E) -18℃

The author takes quite some time to explain that the model assumes a constant humidity and then goes one step forward to explain what this assumption entails - so we need to definitely look out for this in the options.
6. It can be inferred from the passage that the construction of the mathematical model mentioned in the passage involved the formulation of which of the following?
(A) An assumption that the amount of carbon dioxide added to the atmosphere would in reality steadily increase Unrelated - the author was talking about twice the amount present curently - so steady increase is wrong - moreover this is the hypothesis of the model and not the assumption
(B) An assumption that human activities are the only agencies by which carbon dioxide is added to the atmosphere Out of scope of the math model
(C) Assumptions about the social and political consequences of any curtailment of the use of fossil fuels Way out of scope of the model
(D) Assumptions about the physical conditions that are likely to prevail during the period for which the model was made Perfect - mentioned in a esoteric way but "physical conditions" can rightly describe a physical concept of humidity. correct answer
(E) Assumptions about the differential behavior of carbon dioxide molecules at the various levels of temperature calculated in the model Never mentioned

OA should be D according to me. But currently given as B.
Detail question asked from directly mentioned information from the passage
7. According to the passage, which of the following is true of the last hundred years?
(A) Fossil fuels were burned for the first time. Again - this has not been mentioned. "For the first time" makes this option incorrect
(B) Greater amounts of land were cleared than at any time before. "Than any time before" is too extreme and not mentioned in the passage
(C) The average temperature at the Earth’s surface has become 2℃ cooler. Opposite of what is mentioned - the average temperature increased
(D) The amount of carbon dioxide in the atmosphere has increased measurably. Perfect - the passage talks about a 15% increase in the atmospheric CO2 - this is definitely a measurable jump
(E) The amount of farmland worldwide has doubled. Out of scope - not mentioned

Hope this helps. :-)
User avatar
Non-Human User
Joined: 01 Oct 2013
Posts: 17491
Own Kudos [?]: 867 [0]
Given Kudos: 0
Send PM
Re: The molecules of carbon dioxide in the Earths atmosphere affect the h [#permalink]
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.
GMAT Club Bot
Re: The molecules of carbon dioxide in the Earths atmosphere affect the h [#permalink]
Moderators:
GMAT Club Verbal Expert
6979 posts
GMAT Club Verbal Expert
236 posts
GRE Forum Moderator
14051 posts