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Some reputable astrophysicists propose that the Moon was created simul

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Some reputable astrophysicists propose that the Moon was created simul  [#permalink]

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New post Updated on: 06 Oct 2018, 04:49
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Some reputable astrophysicists propose that the Moon was created simultaneously with Earth from the primordial accretion disc. Although such a hypothesis agrees with the hypothetical model on which our solar system is believed to have been built, it nevertheless remains inherently flawed, as it fails to address the high angular momentum of the Earth-Moon system and the lack of metallic iron in the Moon's core. Since the amount of metallic iron in the cores of other planetary bodies in our solar system is considerable, the latter finding is especially damaging to the aforementioned theory's credibility. Nevertheless, another, more plausible theory has emerged which accounts for the Moon's formation. Dubbed the Giant Impact Hypothesis, it conjectures that the Moon was created as a result of a collision of the proto-Earth and another large planetary body roughly the size of Mars. Computer simulations have confirmed that such a hypothesis would indeed produce the existing angular momentum of the Earth-Moon system and the small amount of metallic iron that currently exists in the Moon's core. The Giant Impact Hypothesis is further supported by the findings indicating that samples of mantle rock collected from the Moon's surface are similar in their geochemical composition to loose rock on the Earth's surface.

1. The author's primary purpose is to

A. compare competing theories of the Moon's creation
B. applaud reputable astrophysicists for their theory on lunar formation
C. emphasize scientists' lack of knowledge regarding the Moon's formation
D. show why all theories of the Moon's creation are inherently flawed
E. promote a theory of lunar formation over a competing theory

Answer Choice E:
Lunar formation means "how the moon was formed". The passage deals with two possible theories of how the moon as created:
1) first sentence: created simultaneously with Earth from the primordial accretion disc. The passage then goes on to explain the problems with this theory, leading up to:
2) 7th sentence:Nevertheless, another, more plausible theory has emerged which accounts for the Moon's formation. Dubbed the Giant Impact Hypothesis, it conjectures that the Moon was created as a result of a collision of the proto-Earth and another large planetary body roughly the size of Mars. thus the answer is correct.


2. Which of the following is mentioned in the passage about the Moon's surface?

A. It is exactly identical to the Earth's surface in geochemical composition.
B. Its geochemical composition puts the Giant Impact Hypothesis in doubt.
C. Computer simulations show that its geochemical composition is similar to that of Earth.
D. It contains small amounts of metallic iron.
E. Some of its components are similar to those on Earth's surface.

Answer Choice E. Mantle rock is a component of the Moon's surface, and the passage tells us that it is similar to loose rock, another component, of the Earth's surface.


3. What can be inferred about Earth from the first hypothesis mentioned in the passage?

A. Its core contains a high concentration of metallic iron.
B. It was created after the Moon.
C. The Moon was originally part of Earth.
D. The high angular momentum of the Earth-Moon system casts doubt on our theories of the age of the Earth.
E. Scientists do not know how the Earth was created.

Answer A. Since this theory is weakened by the Moon's lack of iron, we can infer that Earth's core has a large amount of iron in it.


4. According to the first hypothesis mentioned in the passage, the Moon and the Earth are most similar to which of the following?

A. wheat and bread
B. a parent and a child
C. a pair of twins conceived at the same time
D. Earth and the satellites which orbit around it
E. two cars next to each other on an assembly line

Answer C. A pair of twins is created simultaneously, just like the Earth and the Moon according to the first hypothesis of the passage.


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Originally posted by reto on 29 Jul 2015, 11:05.
Last edited by workout on 06 Oct 2018, 04:49, edited 1 time in total.
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Re: Some reputable astrophysicists propose that the Moon was created simul  [#permalink]

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New post 12 Aug 2018, 19:33
Hey workout :)

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Some reputable astrophysicists propose that the Moon was created simul  [#permalink]

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New post 07 Oct 2018, 01:38
3
reto wrote:
Some reputable astrophysicists propose that the Moon was created simultaneously with Earth from the primordial accretion disc. Although such a hypothesis agrees with the hypothetical model on which our solar system is believed to have been built, it nevertheless remains inherently flawed, as it fails to address the high angular momentum of the Earth-Moon system and the lack of metallic iron in the Moon's core. Since the amount of metallic iron in the cores of other planetary bodies in our solar system is considerable, the latter finding is especially damaging to the aforementioned theory's credibility. Nevertheless, another, more plausible theory has emerged which accounts for the Moon's formation. Dubbed the Giant Impact Hypothesis, it conjectures that the Moon was created as a result of a collision of the proto-Earth and another large planetary body roughly the size of Mars. Computer simulations have confirmed that such a hypothesis would indeed produce the existing angular momentum of the Earth-Moon system and the small amount of metallic iron that currently exists in the Moon's core. The Giant Impact Hypothesis is further supported by the findings indicating that samples of mantle rock collected from the Moon's surface are similar in their geochemical composition to loose rock on the Earth's surface.
1. The author's primary purpose is to

A. compare competing theories of the Moon's creation
B. applaud reputable astrophysicists for their theory on lunar formation
C. emphasize scientists' lack of knowledge regarding the Moon's formation
D. show why all theories of the Moon's creation are inherently flawed
E. promote a theory of lunar formation over a competing theory

Answer Choice E:
Lunar formation means "how the moon was formed". The passage deals with two possible theories of how the moon as created:
1) first sentence: created simultaneously with Earth from the primordial accretion disc. The passage then goes on to explain the problems with this theory, leading up to:
2) 7th sentence:Nevertheless, another, more plausible theory has emerged which accounts for the Moon's formation. Dubbed the Giant Impact Hypothesis, it conjectures that the Moon was created as a result of a collision of the proto-Earth and another large planetary body roughly the size of Mars. thus the answer is correct.


2. Which of the following is mentioned in the passage about the Moon's surface?

A. It is exactly identical to the Earth's surface in geochemical composition.
B. Its geochemical composition puts the Giant Impact Hypothesis in doubt.
C. Computer simulations show that its geochemical composition is similar to that of Earth.
D. It contains small amounts of metallic iron.
E. Some of its components are similar to those on Earth's surface.

Answer Choice E. Mantle rock is a component of the Moon's surface, and the passage tells us that it is similar to loose rock, another component, of the Earth's surface.


3. What can be inferred about Earth from the first hypothesis mentioned in the passage?

A. Its core contains a high concentration of metallic iron.
B. It was created after the Moon.
C. The Moon was originally part of Earth.
D. The high angular momentum of the Earth-Moon system casts doubt on our theories of the age of the Earth.
E. Scientists do not know how the Earth was created.

Answer A. Since this theory is weakened by the Moon's lack of iron, we can infer that Earth's core has a large amount of iron in it.


4. According to the first hypothesis mentioned in the passage, the Moon and the Earth are most similar to which of the following?

A. wheat and bread
B. a parent and a child
C. a pair of twins conceived at the same time
D. Earth and the satellites which orbit around it
E. two cars next to each other on an assembly line

Answer C. A pair of twins is created simultaneously, just like the Earth and the Moon according to the first hypothesis of the passage.



Took 6:54 minutes!
All correct!

My take-

1. The author's primary purpose is to[/b]

A. compare competing theories of the Moon's creation- not comparing! Author supports the second theory hands down!
B. applaud reputable astrophysicists for their theory on lunar formation-OFS
C. emphasize scientists' lack of knowledge regarding the Moon's formation-No, partial scope.
D. show why all theories of the Moon's creation are inherently flawed-No, not all!
E. promote a theory of lunar formation over a competing theory-Perfect, he selected second theory over one!

Answer Choice E:
Lunar formation means "how the moon was formed". The passage deals with two possible theories of how the moon as created:
1) first sentence: created simultaneously with Earth from the primordial accretion disc. The passage then goes on to explain the problems with this theory, leading up to:
2) 7th sentence:Nevertheless, another, more plausible theory has emerged which accounts for the Moon's formation. Dubbed the Giant Impact Hypothesis, it conjectures that the Moon was created as a result of a collision of the proto-Earth and another large planetary body roughly the size of Mars. thus the answer is correct.


2. Which of the following is mentioned in the passage about the Moon's surface?

A. It is exactly identical to the Earth's surface in geochemical composition.-No, it lacks metallic core unlike Earth!
B. Its geochemical composition puts the Giant Impact Hypothesis in doubt.-No, OFS
C. Computer simulations show that its geochemical composition is similar to that of Earth.-Computer simulations dont show this!
D. It contains small amounts of metallic iron.-Moon's surface doesnt contain metallic iron, its core does!
E. Some of its components are similar to those on Earth's surface.-True, refer "samples of mantle rock collected from the Moon's surface are similar in their geochemical composition to loose rock on the Earth's surface."

Answer Choice E. Mantle rock is a component of the Moon's surface, and the passage tells us that it is similar to loose rock, another component, of the Earth's surface.


3. What can be inferred about Earth from the first hypothesis mentioned in the passage?

A. Its core contains a high concentration of metallic iron.-Correct refer "Since the amount of metallic iron in the cores of other planetary bodies in our solar system is considerable"
B. It was created after the Moon.-No, opposite!
C. The Moon was originally part of Earth.-No, created simultaneously!
D. The high angular momentum of the Earth-Moon system casts doubt on our theories of the age of the Earth.-OFS, age of earth is not questioned anywhere.
E. Scientists do not know how the Earth was created.-No, they know"primordial accretion disc"(whatever the hell that means! :D)

Answer A. Since this theory is weakened by the Moon's lack of iron, we can infer that Earth's core has a large amount of iron in it.


4. According to the first hypothesis mentioned in the passage, the Moon and the Earth are most similar to which of the following?

A. wheat and bread-Nopes!one is not derived from other! They are created at the same time!
B. a parent and a child-Nopes
C. a pair of twins conceived at the same time-Correct!
D. Earth and the satellites which orbit around it-Nopes
E. two cars next to each other on an assembly line-Nopes

[spoiler=]Answer C. A pair of twins is created simultaneously, just like the Earth and the Moon according to the first hypothesis of the passage.

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Re: Some reputable astrophysicists propose that the Moon was created simul  [#permalink]

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New post 07 Oct 2018, 07:49
Passage Map:

Astrophysicists proposal about Moon fomation is flawed because it does not address 2 things

1. high angular momentum b/w earth and moon

2. lack of iron in the core of moon

Gaint impact theory:Moon is formed due to collision of earth and planetary body

computer simulation supports gaint impact theory

composition of rock samples supports the theory

Primary Purpose:Author supports gaint impact theory over Astrophysicts theory
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Re: Some reputable astrophysicists propose that the Moon was created simul  [#permalink]

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New post 09 Oct 2018, 08:57
GMATPrepNow sir in Q2 why not option d?
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Re: Some reputable astrophysicists propose that the Moon was created simul  [#permalink]

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New post 20 Oct 2018, 11:10
Nice passage, All correct in 6 mins, including 2 mins 40 seconds to read
1. The author's primary purpose is to
A. compare competing theories of the Moon's creation - Incorrect - the Giant Impact Hypothesis is better while the first theory is flawed
B. applaud reputable astrophysicists for their theory on lunar formation - Incorrect
C. emphasize scientists' lack of knowledge regarding the Moon's formation - Incorrect
D. show why all theories of the Moon's creation are inherently flawed - Incorrect
E. promote a theory of lunar formation over a competing theory - Correct - the author promotes Giant Impact Hypothesis over the theory that states that the Moon was created simultaneously with Earth from the primordial accretion disc.
Answer E

2. Which of the following is mentioned in the passage about the Moon's surface?
A. It is exactly identical to the Earth's surface in geochemical composition. - Incorrect - samples of mantle rock collected from the Moon's surface are similar in their geochemical composition to loose rock on the Earth's surface.
B. Its geochemical composition puts the Giant Impact Hypothesis in doubt. - Incorrect - it supports
C. Computer simulations show that its geochemical composition is similar to that of Earth. - Incorrect
D. It contains small amounts of metallic iron. - Incorrect - small amount of metallic iron that currently exists in the Moon's core
E. Some of its components are similar to those on Earth's surface. - Correct - samples of mantle rock collected from the Moon's surface are similar in their geochemical composition to loose rock on the Earth's surface.
Answer E

3. What can be inferred about Earth from the first hypothesis mentioned in the passage?

A. Its core contains a high concentration of metallic iron. - Correct - one of the flaw of first hypothesis is the lack of metallic iron in the Moon's core. Since the amount of metallic iron in the cores of other planetary bodies in our solar system is considerable, the latter finding is especially damaging to the aforementioned theory's credibility.
B. It was created after the Moon. - Incorrect - the Moon was created simultaneously with Earth from the primordial accretion disc
C. The Moon was originally part of Earth. - Incorrect
D. The high angular momentum of the Earth-Moon system casts doubt on our theories of the age of the Earth. - Out of scope
E. Scientists do not know how the Earth was created. - Incorrect



4. According to the first hypothesis mentioned in the passage, the Moon and the Earth are most similar to which of the following?
Some reputable astrophysicists propose that the Moon was created simultaneously with Earth from the primordial accretion disc.
A. wheat and bread - Incorrect
B. a parent and a child - Incorrect - no such relationship is mentioned
C. a pair of twins conceived at the same time - Correct
D. Earth and the satellites which orbit around it - Incorrect
E. two cars next to each other on an assembly line - Incorrect - but we don't know whether these cars were manufactured at the same time.

Answer C

AjiteshArun , GMATNinja , MagooshExpert , GMATGuruNY , VeritasKarishma , DmitryFarber , ChiranjeevSingh , other experts - is option E incorrect because we don't know whether the two adjacent cars were manufactured simultaneously?
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Re: Some reputable astrophysicists propose that the Moon was created simul  [#permalink]

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New post 20 Oct 2018, 17:10
Skywalker18 wrote:
4. According to the first hypothesis mentioned in the passage, the Moon and the Earth are most similar to which of the following?
Some reputable astrophysicists propose that the Moon was created simultaneously with Earth from the primordial accretion disc.
A. wheat and bread - Incorrect
B. a parent and a child - Incorrect - no such relationship is mentioned
C. a pair of twins conceived at the same time - Correct
D. Earth and the satellites which orbit around it - Incorrect
E. two cars next to each other on an assembly line - Incorrect - but we don't know whether these cars were manufactured at the same time.

Answer C

AjiteshArun , GMATNinja , MagooshExpert , GMATGuruNY , VeritasKarishma , DmitryFarber , ChiranjeevSingh , other experts - is option E incorrect because we don't know whether the two adjacent cars were manufactured simultaneously?

Hi Skywalker18,

Yes, in a sense -- two adjacent cars in an assembly line means that one was manufactured immediately before the other one. That isn't the case here, where we're talking about two things that were created at exactly the same time. So if one was right after the other, they weren't created at the same time.

Hope that helps! :)
-Carolyn
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Re: Some reputable astrophysicists propose that the Moon was created simul &nbs [#permalink] 20 Oct 2018, 17:10
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