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# OG_VPR # 24/25 Scientists formerly believed that the rocky p

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OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  12 Oct 2016, 13:19
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50% (02:58) correct 50% (04:49) wrong based on 52 sessions
Scientists formerly believed that the rocky planets—Earth, Mercury, Venus, and Mars—were created by the rapid gravitational collapse of a dust cloud, a deflation giving rise to a dense orb. That view was challenged in the 1960s, when studies of Moon craters revealed that these craters were caused by the impact of objects that
were in great abundance about 4.5 billion years ago but whose number appeared to have quickly decreased shortly thereafter. This observation rejuvenated Otto Schmidt’s 1944 theory of accretion. According to this theory, cosmic dust gradually lumped into ever-larger conglomerates: particulates, gravel, small and then larger balls, planetesimals (tiny planets), and, ultimately, planets. As the planetesimals became larger, their numbers decreased. Consequently, the number of collisions between planetesimals decreased.
For the following question, consider each of the choices separately and select all that apply.

The passage provides evidence that Schmidt would be likely to disagree with the theory presented in the first sentence over

• the length of time it took for the rocky planets to form.
• the most likely causes of the Moon’s impact craters.
• the importance of cosmic dust as a seminal material in planetary formation.

[Reveal] Spoiler: OA
A

Which of the following best describes the “observation” (line 6) referred to in the passage?

A) The rocky planets were created by the rapid gravitational collapse of a dust cloud.
B) Certain features on the Moon’s surface are impact craters caused by collisions with objects such as planetesimals.
C) The rocky planets were formed by a slow accretion of cosmic dust into increasingly larger bodies.
D) The number of objects colliding with the Moon appears to have been high for a while and then rapidly diminished.
E) There are far fewer planetesimals in existence today than there were about 4.5 billion years ago.

[Reveal] Spoiler: OA
D

Practice Questions
Question: 24-25
Page: 130

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Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  12 Oct 2016, 13:21
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Explanation

24) Choice A is correct. The question asks what Schmidt would disagree with in the rapid-collapse theory. Choice A is correct: According to Schmidt’s own theory, “cosmic dust gradually lumped into ever-larger conglomerates”; this means that planetary formation was a prolonged process, while in the rapid-collapse theory, it happened quickly. Choice B is incorrect: Both theories agree that Moon craters were caused by the impact of cosmic bodies that crashed into the Moon’s surface. Choice C is incorrect: Both theories agree that cosmic dust was the material from which the planets ultimately formed.

25) The “observation” mentioned in the passage is the finding that Moon’s craters “were caused by the impact of objects that were in great abundance about 4.5 billion years ago but whose number appeared to have quickly decreased shortly thereafter.” The answer choice that is closest in meaning to this description is Choice D.
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Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  02 Apr 2019, 19:19
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the question alludes to the theory in 1st sentence which does not mention moon craters being formed by collisions. In fact, the moon crater formation is explained in the next sentence which is a challenge to the theory in first sentence. How is answer B incorrect?
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Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  19 Jun 2019, 04:50
the question alludes to the theory in 1st sentence which does not mention moon craters being formed by collisions. In fact, the moon crater formation is explained in the next sentence which is a challenge to the theory in first sentence. How is answer B incorrect?

I agree with you. The passage said that the studies of Moon craters challenged the view in first sentence and rejuvenated Schmidt's theory. So I think B is correct too.
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Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  19 Jun 2019, 07:32
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The passage provides evidence that Schmidt would be likely to disagree with the theory presented in the first sentence over

The blue word indicates that the answer choices correct are B and C and A is wrong. However, this was true if the word would be AGREE. Considering that is the contrary, B and C are wrong and only A is correct.

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Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  26 Jan 2020, 00:59
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Carcass wrote:
The passage provides evidence that Schmidt would be likely to disagree with the theory presented in the first sentence over

The blue word indicates that the answer choices correct are B and C and A is wrong. However, this was true if the word would be AGREE. Considering that is the contrary, B and C are wrong and only A is correct.

Regards

I think the other two people understood the question. I think the contention arises because the first theory does not indicate any belief about the craters on the moon (And is challenges by the idea of rocks hitting the moon 4.5B years ago). In fact all the first theory says is that planets are caused by collapsing dust. Clouds of dust directly turn into planets. Only the second theory mention rocks from planet formation. Why would the first theory believe that planet-forming rocks created 4.5 billion years collided with the moon? Its more likely the first theory would believe moon craters are caused by volcanoes or whatever, rather than objects(nonexistant) during planet formation.

It seems like the two theories differ in their beliefs about the cause of moon's craters?

Any alternative explanations would be appreciated!

Regards,
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Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  27 Jan 2020, 12:03
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greprepper2 wrote:
Carcass wrote:
The passage provides evidence that Schmidt would be likely to disagree with the theory presented in the first sentence over

The blue word indicates that the answer choices correct are B and C and A is wrong. However, this was true if the word would be AGREE. Considering that is the contrary, B and C are wrong and only A is correct.

Regards

I think the other two people understood the question. I think the contention arises because the first theory does not indicate any belief about the craters on the moon (And is challenges by the idea of rocks hitting the moon 4.5B years ago). In fact all the first theory says is that planets are caused by collapsing dust. Clouds of dust directly turn into planets. Only the second theory mention rocks from planet formation. Why would the first theory believe that planet-forming rocks created 4.5 billion years collided with the moon? Its more likely the first theory would believe moon craters are caused by volcanoes or whatever, rather than objects(nonexistant) during planet formation.

It seems like the two theories differ in their beliefs about the cause of moon's craters?

Any alternative explanations would be appreciated!

Regards,

B is not correct. The passage DOES NOT PROVIDE EVIDENCE to conclude that Schmidt would disagree with the theory presented in the first sentence. If there is no evidence in the passage, then we can not infer anything about moon's impact craters that would have made Schmidt disagree with the theory.

Hope that helps.
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Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  28 Jan 2020, 11:37
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theBrahmaTiger wrote:
greprepper2 wrote:
Carcass wrote:
The passage provides evidence that Schmidt would be likely to disagree with the theory presented in the first sentence over

The blue word indicates that the answer choices correct are B and C and A is wrong. However, this was true if the word would be AGREE. Considering that is the contrary, B and C are wrong and only A is correct.

Regards

I think the other two people understood the question. I think the contention arises because the first theory does not indicate any belief about the craters on the moon (And is challenges by the idea of rocks hitting the moon 4.5B years ago). In fact all the first theory says is that planets are caused by collapsing dust. Clouds of dust directly turn into planets. Only the second theory mention rocks from planet formation. Why would the first theory believe that planet-forming rocks created 4.5 billion years collided with the moon? Its more likely the first theory would believe moon craters are caused by volcanoes or whatever, rather than objects(nonexistant) during planet formation.

It seems like the two theories differ in their beliefs about the cause of moon's craters?

Any alternative explanations would be appreciated!

Regards,

B is not correct. The passage DOES NOT PROVIDE EVIDENCE to conclude that Schmidt would disagree with the theory presented in the first sentence. If there is no evidence in the passage, then we can not infer anything about moon's impact craters that would have made Schmidt disagree with the theory.

Hope that helps.

Yeah that actually makes some sense. I was inferring too much.

I think my mistake was inferring that Schmidt would agree with (rocks causing craters) because that was what rejuvinated his theory. Actually his theory doesn't say anything about the moon.
We can't make this link right?

You know it's so frustrating because the GRE expects you to sometimes make inferences, but sometimes don't. :D
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Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  29 Jan 2020, 03:53
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Yes, correct. The first theory doesn’t say anything about moon craters, so we can’t infer that Schmidt would disagree with it.
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Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p [#permalink]  10 Apr 2020, 01:32
theBrahmaTiger wrote:
Yes, correct. The first theory doesn’t say anything about moon craters, so we can’t infer that Schmidt would disagree with it.

My god. The GRE is playing games with me.
Re: OG_VPR # 24/25 Scientists formerly believed that the rocky p   [#permalink] 10 Apr 2020, 01:32
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