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The Gulches is an area of volcanic rock that is gashed by many channel

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The Gulches is an area of volcanic rock that is gashed by many channel [#permalink]

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New post 06 Oct 2017, 03:13
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64% (02:01) correct 36% (01:40) wrong based on 84 sessions

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The Gulches is an area of volcanic rock that is gashed by many channels that lead downhill from the site of a prehistoric glacier to a river. The channels clearly were cut by running water. It was once accepted as fact that the cutting occurred gradually, as the glacier melted. But one geologist theorized that the channels were cut in a short time by an enormous flood. The channels do show physical evidence of having been formed quickly, but the flood theory was originally rejected because scientists knew of no natural process that could melt so much ice so quickly. Paradoxically, today the scientific community accepts the flood theory even though scientists still do not know of a process that can melt so much ice so quickly.

Which one of the following, if true, most helps to resolve the apparent paradox in the passage?

(A) Rippies, which indicate that the channels were cut by water, have been discovered in the floors of the channels.

(B) The Guiches is known to be similar in certain respects to many other volcanic rock formations.

(C) More than one glacier was present in the area during prehistoric times.

(D) Volcanic rock is more easily cut by water than are other forms of rock.

(E) Scientists now believe that the prehistoric glacier dammed a source of water, created a huge lake in the process, and then retreated.
[Reveal] Spoiler: OA

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Re: The Gulches is an area of volcanic rock that is gashed by many channel [#permalink]

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New post 06 Oct 2017, 19:44
Question Type: Paradox

We have to explain why the flood theory was accepted even though scientists did not know of a process that could melt ice so quickly.

(A) Rippies, which indicate that the channels were cut by water, have been discovered in the floors of the channels. - Incorrect. The channels were cut by water, but we do not know whether the channels were cut by slow moving water or floods. Not Sufficient.

(B) The Guiches is known to be similar in certain respects to many other volcanic rock formations. - Incorrect. Irrelevant.

(C) More than one glacier was present in the area during prehistoric times. - Incorrect. Irrelevant.

(D) Volcanic rock is more easily cut by water than are other forms of rock. - Incorrect. We cannot explain the acceptance of flood theory based on this fact.

(E) Scientists now believe that the prehistoric glacier dammed a source of water, created a huge lake in the process, and then retreated. - Correct.

Answer: E

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Re: The Gulches is an area of volcanic rock that is gashed by many channel [#permalink]

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New post 07 Oct 2017, 02:02
is the answer E? other options doesn't seem convincing....
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Re: The Gulches is an area of volcanic rock that is gashed by many channel [#permalink]

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New post 07 Oct 2017, 03:58
Option E fits the bill !
it clearly supports the flood theory but doesn't reveal how glacier melted.

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Re: The Gulches is an area of volcanic rock that is gashed by many channel   [#permalink] 07 Oct 2017, 03:58
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The Gulches is an area of volcanic rock that is gashed by many channel

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