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Verbal OG 2016 - Within the earth's core, which is iron, pressure

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Verbal OG 2016 - Within the earth's core, which is iron, pressure [#permalink]

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Official Guide for GMAT Verbal Review 2016
Practice Question
Question No.:28
Page: 129
Difficulty:


Which of the following most logically completes the argument below?

Within the earth's core, which is iron, pressure increases with depth. Because the temperature at which iron melts increases with pressure, the inner core is solid and the outer core is molten. Physicists can determine the melting temperature of iron at any given pressure and the pressure for any given depth in the earth. Therefore, the actual temperature at the boundary of the earth's outer and inner cores--the melting temperature of iron there--can be determined, since_______.

a) the depth beneath the earth's surface of the boundary between the outer and inner cores is known
b) some of the heat from the earth's core flows to the surface of the earth
c) pressures within the earth's outer core are much greater than pressures above the outer core
d) nowhere in the earth's core can the temperature be measured directly
e) the temperatures within the earth's inner core are higher than in the outer core
[Reveal] Spoiler: OA

Last edited by nycgirl212 on 04 Jun 2016, 23:46, edited 1 time in total.

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Re: Verbal OG 2016 - Within the earth's core, which is iron, pressure [#permalink]

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New post 30 May 2016, 09:47
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This question is an Assumption type . If we keep P for pressure, T for melting temperature and D for depth from the surface, we have
Higher D --> Higher P,(1st line)
Higher P --> Higher T,( 1st line)
and they can determine P and T for any depth (D).

Think like this. If they knew exact temperature, they should know the pressure --> they should have knowledge on the depth. So there's your answer.

Give kudos if you find the explanation useful.

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Re: Verbal OG 2016 - Within the earth's core, which is iron, pressure [#permalink]

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New post 30 May 2016, 10:01
Argument:- Within the earth's core, which is iron, pressure increases with depth. Because the temperature at which iron melts increases with pressure, the inner core is solid and the outer core is molten. Physicists can determine the melting temperature of iron at any given pressure and the pressure for any given depth in the earth. Therefore, the actual temperature at the boundary of the earth's outer and inner cores--the melting temperature of iron there--can be determined, since_______.

The correct answer choice is "A" and my explanation as follows:

Option A states "a) the depth beneath the earth's surface of the boundary between the outer and inner cores is known"
The highlighted portion above in the argument states that for a "given" pressure / depth it is possible to determine temperature therefore the assumption that would logically complete this argument is that either or both of these parameters are "given" or in other words "known".

Kudos if you think this explanation most logically completes the choice of answer :-)

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Re: Verbal OG 2016 - Within the earth's core, which is iron, pressure [#permalink]

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New post 05 Aug 2016, 09:20
Hi guys!

I have a question regarding the argument.
Context: Earth's core is iron.
1st premise: +Depth (D)-> +Pressure (P)
2nd premise: +P --> +Temperature (T) at which Iron melts
Based on this facts, the Intermediate Conclusion says that Earth's inner core is solid and the outer is molten.

However, according to the facts, the inner core should be molten and the outer one solid because D is higher in the inner core, so is P and T = inner core is molten and outer core might be solid.
I spend a lot of time trying to understand this apparent contradiction in this argument, in which the author takes only one position.

Is my understanding correct??

I appreciate your help in advance. Thanks.

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Re: Verbal OG 2016 - Within the earth's core, which is iron, pressure [#permalink]

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New post 16 Aug 2017, 07:26
A is the correct choice - If physicists know the depth of the boundary between inner and outer cores, they can also determine the temperature at the boundary.
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Re: Verbal OG 2016 - Within the earth's core, which is iron, pressure [#permalink]

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New post 29 Aug 2017, 01:26
nycgirl212 wrote:
Official Guide for GMAT Verbal Review 2016
Practice Question
Question No.:28
Page: 129
Difficulty:


Which of the following most logically completes the argument below?

Within the earth's core, which is iron, pressure increases with depth. Because the temperature at which iron melts increases with pressure, the inner core is solid and the outer core is molten. Physicists can determine the melting temperature of iron at any given pressure and the pressure for any given depth in the earth. Therefore, the actual temperature at the boundary of the earth's outer and inner cores--the melting temperature of iron there--can be determined, since_______.

a) the depth beneath the earth's surface of the boundary between the outer and inner cores is known
b) some of the heat from the earth's core flows to the surface of the earth
c) pressures within the earth's outer core are much greater than pressures above the outer core
d) nowhere in the earth's core can the temperature be measured directly
e) the temperatures within the earth's inner core are higher than in the outer core



This is actually a straight forward unless you miss the last few words in option A. Knowing the depth will help us with figuring out the pressure, which is directly related to temp.

Option C, talks about the co-relation between pressure and outer core.

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Re: Verbal OG 2016 - Within the earth's core, which is iron, pressure   [#permalink] 29 Aug 2017, 01:26
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