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Most geologists believe oil results from chemical

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Most geologists believe oil results from chemical [#permalink]

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New post 11 Jul 2008, 10:36
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Most geologists believe oil results from chemical transformations of hydrocarbons derived from organisms buried under ancient seas. Suppose, instead, that oil actually results from bacterial action on other complex hydrocarbons that are trapped within the Earth. As is well known, the volume of these hydrocarbons exceeds that of buried organisms. Therefore, our oil reserves would be greater than most geologists believe.

Which of the following, if true, gives the strongest support to the argument above about our oil reserves?

(A) Most geologists think optimistically about the Earths reserves of oil.

(B) Most geologists have performed accurate chemical analyses on previously discovered oil reserves.

(C) Ancient seas are buried within the Earth at many places where fossils are abundant.

(D) The only bacteria yet found in oil reserves could have leaked down drill holes from surface contaminants.

(E) Chemical transformations reduce the volume of buried hydrocarbons derived from organisms by roughly the same proportion as bacterial action reduces the volume of other complex hydrocarbons.
[Reveal] Spoiler: OA

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Most geologists believe oil results from chemical [#permalink]

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Most geologists believe oil results from chemical transformations of hydrocarbons derived from organisms buried under ancient seas. Suppose,instead, that oil actually results from bacterial action on other complex hydrocarbons that are trapped within the Earth. As is well known, the volume of these hydrocarbons exceeds that of buried organisms. Therefore, our oil reserves would be greater than most geologists believe.

Which of the following, if true, gives the strongest support to the argument above about our oil reserves?

(A) Most geologists think optimistically about the Earth's reserves of oil.
(B) Most geologists have performed accurate chemical analyses on previously discovered oil reserves.
(C) Ancient seas are buried within the Earth at many places where fossils are abundant.
(D) The only bacteria yet found in oil reserves could have leaked down drill holes from surface contaminants.
(E) Chemical transformations reduce the volume of buried hydrocarbons derived from organisms by roughly the same proportion as bacterial action reduces the volume of other complex hydrocarbons.
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New post 20 Aug 2009, 19:53
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Which of the following, if true, gives the strongest support to the argument above about our oil reserves?

(A) Most geologists think optimistically about the Earth's reserves of oil.
> lesser reserves > weaken.

(B) Most geologists have performed accurate chemical analyses on previously discovered oil
reserves.
> neutral.

(C) Ancient seas are buried within the Earth at many places where fossils are abundant.
> neutral.

(D) The only bacteria yet found in oil reserves could have leaked down drill holes from surface
contaminants.
> weakens the hypothesis > weakens conclusion.

(E) Chemical transformations reduce the volume of buried hydrocarbons derived from organisms by roughly the same proportion as bacterial action reduces the volume of other complex hydrocarbons.
> same 'yield' > but hydrocarbon is more abundant > conclusio is strengthened.

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New post 26 Sep 2009, 07:35
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A) Most geologists think optimistically about the Earth's reserves of oil.
weakens the conclusion in a way.

(B) Most geologists have performed accurate chemical analyses on previously discovered oil
reserves.
this doesn't support the conclusion.

(C) Ancient seas are buried within the Earth at many places where fossils are abundant.
Not related

(D) The only bacteria yet found in oil reserves could have leaked down drill holes from surface
contaminants.
weakens the conclusion.

(E) Chemical transformations reduce the volume of buried hydrocarbons derived from organisms by roughly the same proportion as bacterial action reduces the volume of other complex hydrocarbons.

this shows the possibility of the stated Conclusion so strengthens :)

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Re: CR : Most geologists believe oil results [#permalink]

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New post 11 Jul 2008, 10:54
It should be E IMO.

because if both chemical transformation and bacteria are reducing hydrocarbon and complex hydrocarbons respectively to the same amount then obviously oil reserves will be more for the one which is in greater quantity beneath the earth( which is the complex hydrocarbon in this case)

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Re: CR : Most geologists believe oil results [#permalink]

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New post 11 Jul 2008, 10:55
E. tranformation ratio is same, its given that there are more complex hydrocarbin than organism

100 organism --> chemical tranformation --> 10 oil
1000 complex hydrocarbon --> bacterial reaction --> 100 oil

means there'll be more oil

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Most geologists believe oil results from chemical [#permalink]

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New post 20 Aug 2009, 16:00
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Most geologists believe oil results from chemical
transformations of hydrocarbons derived from
organisms buried under ancient seas. Suppose,
instead, that oil actually results from bacterial action
on other complex hydrocarbons that are trapped
within the Earth. As is well known, the volume of
these hydrocarbons exceeds that of buried organ-
isms. Therefore, our oil reserves would be greater
than most geologists believe.

Which of the following, if true, gives the strongest
support to the argument above about our oil
reserves?
(A) Most geologists think optimistically about the
Earth's reserves of oil.
(B) Most geologists have performed accurate chem-
ical analyses on previously discovered oil
reserves.
(C) Ancient seas are buried within the Earth at
many places where fossils are abundant.
(D) The only bacteria yet found in oil reserves could
have leaked down drill holes from surface
contaminants.
(E) Chemical transformations reduce the volume of
buried hydrocarbons derived from organisms
by roughly the same proportion as bacterial
action reduces the volume of other complex
hydrocarbons.

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Re: 100 CR Toughie [#permalink]

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New post 20 Aug 2009, 19:48
sher676 wrote:
Most geologists believe oil results from chemical
transformations of hydrocarbons derived from
organisms buried under ancient seas. Suppose,
instead, that oil actually results from bacterial action
on other complex hydrocarbons that are trapped
within the Earth. As is well known, the volume of
these hydrocarbons exceeds that of buried organ-
isms. Therefore, our oil reserves would be greater
than most geologists believe.

Which of the following, if true, gives the strongest
support to the argument above about our oil
reserves?
(A) Most geologists think optimistically about the
Earth's reserves of oil.
(B) Most geologists have performed accurate chem-
ical analyses on previously discovered oil
reserves.
(C) Ancient seas are buried within the Earth at
many places where fossils are abundant.
(D) The only bacteria yet found in oil reserves could
have leaked down drill holes from surface
contaminants.
(E) Chemical transformations reduce the volume of
buried hydrocarbons derived from organisms
by roughly the same proportion as bacterial
action reduces the volume of other complex
hydrocarbons.


Answer choice is E

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Re: 100 CR Toughie [#permalink]

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New post 20 Aug 2009, 22:57
OA E

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Re: 100 CR Toughie [#permalink]

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New post 26 Sep 2009, 23:38
I'll say E too.
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Re: CR : Most geologists believe oil results [#permalink]

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New post 03 Sep 2010, 07:26
the logic for this question is so far-fetched! I got stumped with this one.

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Re: CR : Most geologists believe oil results [#permalink]

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New post 03 Sep 2010, 09:46
IMO C ---> Reasoning that the fossils that are formed from abundant fossils strengthen the point that the earth reserves are more.
IS my reasoning flawed

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Re: CR : Most geologists believe oil results [#permalink]

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New post 03 Sep 2010, 09:48
I agree it should be E.
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New post 15 May 2011, 07:31
E gives the reasoning.
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New post 15 May 2011, 09:43
E strengthen the hypothetical conclusion that 'our oil reserves would be greater
than most geologists believe'.
because 'reduction in same proportion' is used , so greater amount of something -> more is left after proportional reduction.
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Re: Most geologists believe oil results from chemical [#permalink]

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New post 10 Jul 2012, 05:45
Correct answer should be E.

Since both processes (bacterial and chemical) convert their respective starting materials (of which, by the way, there is more of for the chemical process), we can comfortably conclude that the reserves of oil would be more than previously thought.

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Re: Most geologists believe oil results from chemical [#permalink]

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New post 03 Oct 2012, 23:39
+1E

Premise 1 - Most geologists believe oil results from chemical transformations of hydrocarbons derived from organisms buried under ancient seas. Suppose instead, that oil actually results from bacterial action on other complex hydrocarbons that are trapped within the Earth.

Premise 2 - As is well known, the volume of these hydrocarbons exceeds that of buried organisms

Conclusion - Therefore, our oil reserves would be greater than most geologists believe.

If we look at premise 2 , it states that the “volume of the hydrocarbons exceeds that of buried organisms”. I think, if any option ascertains this or add something to the premise, it will be our answer.

Option E clearly states that that change in volume is same for both, (volume of the hydrocarbons exceeds that of buried organisms), (oil actually results from bacterial action on other complex hydrocarbons that are trapped within the Earth), these imply that the oil reserves are high.

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Re: Most geologists believe oil results from chemical [#permalink]

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New post 06 Oct 2012, 01:09
(A) Most geologists think optimistically about the Earth's reserves of oil.
What they think has no bearing on the actual truth about oil reserve.

(B) Most geologists have performed accurate chemical analyses on previously discovered oil reserves.
doesn't put any support on why there are greater oil reserve than what most believe

(C) Ancient seas are buried within the Earth at many places where fossils are abundant.
we need something that explains why we should think we can extract more oil

(D) The only bacteria yet found in oil reserves could have leaked down drill holes from surface contaminants.
irrelevant

(E) Chemical transformations reduce the volume of buried hydrocarbons derived from organisms by roughly the same proportion as bacterial action reduces the volume of other complex hydrocarbons.

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Re: Most geologists believe oil results from chemical [#permalink]

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New post 09 Oct 2012, 02:34
Firstly, I choose choice E. however, after a moment of stupid thinking. i think differently, and choose B. Can anyone help me to explore the confusion of choice B. Thank you.
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Re: Most geologists believe oil results from chemical [#permalink]

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New post 09 Oct 2012, 03:01
tuanquang269 wrote:
Firstly, I choose choice E. however, after a moment of stupid thinking. i think differently, and choose B. Can anyone help me to explore the confusion of choice B. Thank you.


It is given that VOLUME of these hydrocarbons exceeds that of buried organisms. Let us say 100 m3 and 50m3

Option E states that the proportion with which they are converted are equal. (1 liter of oil is produced) from every 1m3 of buried hydrocarbons as well as from other complex hydrocarbons

This shows that 100m3 will give 100 liter of oil whereas 50 m3 will give 50 liter. Though this option does not relate the exact production of oil with their volume, I think it is open for debate. I still find it better than others.

Thoughts?

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Re: Most geologists believe oil results from chemical   [#permalink] 09 Oct 2012, 03:01

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