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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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02 Oct 2012, 08:42
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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.
[Reveal] Spoiler: OA

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

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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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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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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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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]

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09 Oct 2012, 03:26
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E is right. We can check by negating E and seeing whether that would weaken the conclusion.
Chemical transformations reduce the volume of buried hydrocarbons derived from organisms in a much greater proportion than bacterial action reduces the volume of other complex hydrocarbons. - This would mean that even though the volume of the hydrocarbons exceeds that of buried organisms, the oil reserves resulting from bacterial action on them might be much lesser.
eg: If 10000000000 Kgs of the hydrocarbons only gives 1 litre of oil this would hardly make any difference
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Re: Most geologists believe oil results from chemical [#permalink]

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09 Oct 2012, 03:31
MacFauz wrote:
E is right. We can check by negating E and seeing whether that would weaken the conclusion.
Chemical transformations reduce the volume of buried hydrocarbons derived from organisms in a much greater proportion than bacterial action reduces the volume of other complex hydrocarbons. - This would mean that even though the volume of the hydrocarbons exceeds that of buried organisms, the oil reserves resulting from bacterial action on them might be much lesser.
eg: If 10000000000 Kgs of the hydrocarbons only gives 1 litre of oil this would hardly make any difference

Negation technique is used only in Assumptions type. Don't you think?

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

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09 Oct 2012, 04:36
getgyan wrote:
MacFauz wrote:
E is right. We can check by negating E and seeing whether that would weaken the conclusion.
Chemical transformations reduce the volume of buried hydrocarbons derived from organisms in a much greater proportion than bacterial action reduces the volume of other complex hydrocarbons. - This would mean that even though the volume of the hydrocarbons exceeds that of buried organisms, the oil reserves resulting from bacterial action on them might be much lesser.
eg: If 10000000000 Kgs of the hydrocarbons only gives 1 litre of oil this would hardly make any difference

Negation technique is used only in Assumptions type. Don't you think?

True. However, you can see that what I did was not negation per se. The "opposite" maybe would be a better term to describe it. My logic is that a statement which strengthens a conclusion when "opposited"(for lack of a better word) should weaken the conclusion.
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Re: Most geologists believe oil results from chemical [#permalink]

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13 Oct 2012, 23:41
kingb 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 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.

King - could you please let us know the source of these problems please?
Thanks in anticipation...
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Re: Most geologists believe oil results from chemical [#permalink]

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08 Jul 2014, 02:10
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Re: Most geologists believe oil results from chemical [#permalink]

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06 Nov 2016, 23:48
（E） for sure 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] 06 Nov 2016, 23:48
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