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Most geologists believe oil results from chemical

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Most geologists believe oil results from chemical [#permalink] New post 20 Aug 2009, 15:00
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60% (02:52) correct 40% (02:30) wrong based on 102 sessions
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] New post 20 Aug 2009, 18:53
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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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Re: 100 CR Toughie [#permalink] New post 26 Sep 2009, 06:35
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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: 100 CR Toughie [#permalink] New post 20 Aug 2009, 18:48
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] New post 20 Aug 2009, 21:57
OA E
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Re: 100 CR Toughie [#permalink] New post 26 Sep 2009, 22:38
I'll say E too.
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Re: 100 CR Toughie [#permalink] New post 15 May 2011, 06:31
E gives the reasoning.
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Re: 100 CR Toughie [#permalink] New post 15 May 2011, 08:43
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] New post 10 Jul 2012, 04:45
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.

Cheers,
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Re: Most geologists believe oil results from chemical [#permalink] New post 14 May 2014, 01:53
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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).

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Re: Most geologists believe oil results from chemical   [#permalink] 14 May 2014, 01:53
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