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Updated on: 19 Apr 2013, 11:33
Originally posted by guerrero25 on 19 Apr 2013, 11:17.
Last edited by guerrero25 on 19 Apr 2013, 11:33, edited 1 time in total.
Last edited by guerrero25 on 19 Apr 2013, 11:33, edited 1 time in total.
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
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Question Stats:
53% (01:54) correct
47%
(02:10)
wrong
based on 708
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Methanogensis describes the formation of methane by microbes known as methanogens. The production of methane is often the final step in the decomposition of biomass, such as that found in cow manure. Clearly, therefore, by taking the resulting increase in methane levels in the atmosphere over the past decade and then determining how many decades of such increases it would have taken the atmosphere to reach current methane levels from a hypothetical initial methane-free state, the maximum age of the Earth's atmosphere can be accurately estimated.
Which of the following is an assumption on which the argument depends?
(A)The quantities of methane release into the atmosphere have not been unusually large during the past decade.
(B)At any given time, all layers of the atmosphere have about the same methane levels.
(C)There is methane that is released into the atmosphere from human activity, such as fossil fuel burning.
(D)There is no method superior to that based on methane levels for estimating the maximum age of the Earth’s atmosphere.
(E)None of the methane released into the Earth’s atmosphere is used up by plant activity.
I need some some help to answer this question . totally confused !!
OA to follow soon..
Which of the following is an assumption on which the argument depends?
(A)The quantities of methane release into the atmosphere have not been unusually large during the past decade.
(B)At any given time, all layers of the atmosphere have about the same methane levels.
(C)There is methane that is released into the atmosphere from human activity, such as fossil fuel burning.
(D)There is no method superior to that based on methane levels for estimating the maximum age of the Earth’s atmosphere.
(E)None of the methane released into the Earth’s atmosphere is used up by plant activity.
I need some some help to answer this question . totally confused !!
OA to follow soon..
19 Apr 2013, 11:30
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That's a good one, my answer is A.
The text says that "methane is often the final step in the decomposition of biomass" and they want to detemine the age of the earth " by taking the resulting increase in methane levels in the atmosphere over the past decade" and using it as a "scale".
This approch relies, generally speaking, on the uniformity of the methane during the years. If one period has had an unsual high level of methane then all the process will not be significant.
Now, basing my answer on this concept, I pick A:
(A)The quantities of methane release into the atmosphere have not been unusually large during the past decade.
As you can see A relies on the stats of the last decade, and if those are unusually high, the whole process is compromised.
There are also other good option as
(E)None of the methane released into the Earth’s atmosphere is used up by plant activity.
(C)There is methane that is released into the atmosphere from human activity, such as fossil fuel burning.
that could represent a good answer, but since we are talking about "the last decade", A (IMO) is better.
Waiting for OA...
The text says that "methane is often the final step in the decomposition of biomass" and they want to detemine the age of the earth " by taking the resulting increase in methane levels in the atmosphere over the past decade" and using it as a "scale".
This approch relies, generally speaking, on the uniformity of the methane during the years. If one period has had an unsual high level of methane then all the process will not be significant.
Now, basing my answer on this concept, I pick A:
(A)The quantities of methane release into the atmosphere have not been unusually large during the past decade.
As you can see A relies on the stats of the last decade, and if those are unusually high, the whole process is compromised.
There are also other good option as
(E)None of the methane released into the Earth’s atmosphere is used up by plant activity.
(C)There is methane that is released into the atmosphere from human activity, such as fossil fuel burning.
that could represent a good answer, but since we are talking about "the last decade", A (IMO) is better.
Waiting for OA...
