In the late nineteenth century, the archaeologist Charles : GMAT Critical Reasoning (CR)
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# In the late nineteenth century, the archaeologist Charles

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In the late nineteenth century, the archaeologist Charles [#permalink]

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26 Sep 2013, 02:18
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In the late nineteenth century, the archaeologist Charles Warren discovered a new way to explore otherwise inaccessible areas, using vertical shafts leading to horizontal tunnels deep beneath the surface. These tunnels led directly to those areas. Based on Warren's discovery, Zachi Zweig, a rising star in the archaeological scene, has concluded that similar shafts may be dug on shores in proximity to sunken archeological artifacts, leading to tunnels beneath the sea floor allowing easy access to those artifacts.

What is the hidden assumption underlying Prof. Zweig's hypothesis?

A) The specific weight of water and earth are similar, thus creating the same pressure on the tunnel's ceiling.
B) Otherwise inaccessible sunken archeological artifacts can be reached using new technological advancements in the world of marine robotics.
C) Tunnels beneath the seafloor and tunnels beneath dry land share the same vertical distance from the surface.
D) Shafts similar to those dug by the celebrated Warren may be dug on the sea-shore, enabling archaeologists easy access to otherwise inaccessible sunken archeological artifacts.

E) Otherwise inaccessible terrain can be reached below the surface using vertical shafts.

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[Reveal] Spoiler: OA

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Re: In the late nineteenth century, the archaeologist Charles [#permalink]

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26 Sep 2013, 22:10
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Transcendentalist wrote:
In the late nineteenth century, the archaeologist Charles Warren discovered a new way to explore otherwise inaccessible areas, using vertical shafts leading to horizontal tunnels deep beneath the surface. These tunnels led directly to those areas. Based on Warren's discovery, Zachi Zweig, a rising star in the archaeological scene, has concluded that similar shafts may be dug on shores in proximity to sunken archeological artifacts, leading to tunnels beneath the sea floor allowing easy access to those artifacts.

What is the hidden assumption underlying Prof. Zweig's hypothesis?

A) The specific weight of water and earth are similar, thus creating the same pressure on the tunnel's ceiling.
B) Otherwise inaccessible sunken archeological artifacts can be reached using new technological advancements in the world of marine robotics.
C) Tunnels beneath the seafloor and tunnels beneath dry land share the same vertical distance from the surface.
D) Shafts similar to those dug by the celebrated Warren may be dug on the sea-shore, enabling archaeologists easy access to otherwise inaccessible sunken archeological artifacts.

E) Otherwise inaccessible terrain can be reached below the surface using vertical shafts.

OE to follow

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This question is a bit awkward as it's not a great representation of a GMAT question (it looks like it's from the Economist?)

Anyway, as the prior posts indicate, removing 3 of the 5 options is relatively easy (very common on CR questions) and we are left with 2 options that both seem to be possible answers, A&C. On Critical Reasoning, you want to get rid of the garbage (obviously wrong answers) quickly so you can spend time working on the 2 possible answers.

Let's dig into A&C. The premise of the argument presents an approach of digging deep vertical shafts connected to tunnels that will reach previously unaccessible areas. The conclusion is that the same method can be used to reach sunken artifacts (under water). What is the necessary assumption between A & C? Let's try negating...

Negated A - The specific weight of water and earth are not similar, thus creating different pressure on the tunnel's ceiling.
If there is different pressure between the tunnels under ground and under sea and there is more pressure under sea, might the under sea tunnels collapse and prevent reaching the sunken artifacts? Very possibly.
Negated C - Tunnels beneath the seafloor and tunnels beneath dry land do not share the same vertical distance from the surface.
Does the distance to the surface impact the ability to dig shafts connected to tunnels? The premise states that the underground tunnels are "deep" under the earth so it appears that depth doesn't impact the ability to use this technique.

Normally with negation we get the destruction of the conclusion. I wouldn't say that negated 'A' destroys the conclusion, but it seems to do much more harm to the conclusion than negated 'C', so we will choice answer choice A.

KW
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Re: In the late nineteenth century, the archaeologist Charles [#permalink]

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27 Sep 2013, 03:20
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Transcendentalist wrote:
In the late nineteenth century, the archaeologist Charles Warren discovered a new way to explore otherwise inaccessible areas, using vertical shafts leading to horizontal tunnels deep beneath the surface. These tunnels led directly to those areas. Based on Warren's discovery, Zachi Zweig, a rising star in the archaeological scene, has concluded that similar shafts may be dug on shores in proximity to sunken archeological artifacts, leading to tunnels beneath the sea floor allowing easy access to those artifacts.

What is the hidden assumption underlying Prof. Zweig's hypothesis?

A) The specific weight of water and earth are similar, thus creating the same pressure on the tunnel's ceiling.
B) Otherwise inaccessible sunken archeological artifacts can be reached using new technological advancements in the world of marine robotics.
C) Tunnels beneath the seafloor and tunnels beneath dry land share the same vertical distance from the surface.
D) Shafts similar to those dug by the celebrated Warren may be dug on the sea-shore, enabling archaeologists easy access to otherwise inaccessible sunken archeological artifacts.

E) Otherwise inaccessible terrain can be reached below the surface using vertical shafts.

OE to follow

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There are certainly a lot of issues in this question - the argument says that shafts may be dug, leading to tunnels. So it seems like the tunnels already exist and can be accessed easily - all you have to do is dig deep shafts to access them. If that is the case, the specific weights of water and earth don't come in the picture. The tunnels are there - you just access them by digging a hole at some point. Whatever the weight above them, they are already supporting it.
Another case is where you dig deep shafts and then dig in some way to get access to the tunnels. If that is the case, you need to be careful about the weight above the tunnel you are making. But you may still be able to make them thicker - just like you can make shafts longer or shorter if the depth of sea shore tunnels are different from the depth of dry land tunnels. So neither A nor C is an assumption. If one of them is an assumption, the other becomes an assumption too.
The only reason I may pick A instead of C is that C says 'same vertical distance' and A says 'similar specific weight'. So C is more binding and hence not necessarily true. Also digging deeper may be easier than withstanding higher weight.
Another possibility is that the question implies that due to the higher specific weight, the tunnels may already be blocked at places - for that we need a lot more technical know how of how the tunnels are identified etc which is outside the scope of this argument.

All in all, I wouldn't worry about this question. As Kyle said, it is not representative of actual GMAT questions.
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Re: In the late nineteenth century, the archaeologist Charles [#permalink]

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12 Oct 2013, 05:01
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I agree that it is a bit ironic that we have so many GMAT questions that don't come from the GMAT itself but there is a good reason for it. There are only so many GMAT questions available for our review that we wouldn't have nearly as many helpful discussions if we were limited to actual GMAT questions. The 'GMAT' questions from other sources are for the most part very representative of an actual GMAT question but now and again you will find examples that aren't super close to the real thing. In those cases you consider the source and move on

KW

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Re: In the late nineteenth century, the archaeologist Charles [#permalink]

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26 Sep 2013, 03:57
Ok Hidden assumption - looking at simple definition of assumption - its some thing taken for granted - so lets look at the options and see what will fit the case here -

A)The specific weight of water and earth are similar, thus creating the same pressure on the tunnel's ceiling.
ok - looks like a good reason to believe that the tunnels are actually possible under the sea - hold
B) Otherwise inaccessible sunken archeological artifacts can be reached using new technological advancements in the world of marine robotics.
nothing to do with the argument
C) Tunnels beneath the seafloor and tunnels beneath dry land share the same vertical distance from the surface.
ok - so what ??
D) Shafts similar to those dug by the celebrated Warren may be dug on the sea-shore, enabling archaeologists easy access to otherwise inaccessible sunken archeological artifacts.
Same info as the argument - not helpful
E) Otherwise inaccessible terrain can be reached below the surface using vertical shafts.
ok - so what does - does not help us with a assumption

So - A remaining - re read it and it looks quite good
IMO - A
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Re: In the late nineteenth century, the archaeologist Charles [#permalink]

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26 Sep 2013, 07:17
Imo C

If the tunnels in sea are hopelessly deep then it may not be accessible, thus destroying the conclusion.

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Re: In the late nineteenth century, the archaeologist Charles [#permalink]

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10 Oct 2013, 16:47
can the moderator remove the questions which are not GMAT? why to have non-gmat question on GMAT Club..its ironical.
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Re: In the late nineteenth century, the archaeologist Charles   [#permalink] 10 Oct 2013, 16:47
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