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Eight large craters run in a long straight line across a geographical

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Eight large craters run in a long straight line across a geographical  [#permalink]

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New post 09 Feb 2019, 11:29
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E

Difficulty:

  95% (hard)

Question Stats:

34% (02:14) correct 66% (02:50) wrong based on 62 sessions

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Eight large craters run in a long straight line across a geographical region. Although some of the craters contain rocks that have undergone high-pressure shocks characteristic of meteorites slamming into Earth, these shocks could also have been caused by extreme volcanic events. Because of the linearity of the craters, it is very unlikely that some of them were caused by meteorites. Thus, since the craters are all different ages, they were probably caused by volcanic events rather than meteorites.

Which one of the following statements, if true, would most strengthen the argument?

(A) A similar but shorter line of craters that are all the same age is known to have been caused by volcanic activity

(B) No known natural causes would likely account for eight meteorite craters of different ages forming a straight line

(C) There is no independent evidence of either meteorites or volcanic activity in the region where the craters are located

(D) There is no independent evidence of a volcanic event strong enough to have created the high-pressure shocks that are characteristic of meteorites slamming into Earth

(E) No known single meteor shower has created exactly eight impact craters that form a straight line

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Eight large craters run in a long straight line across a geographical  [#permalink]

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New post 09 Feb 2019, 11:59
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Situation: Eight large craters, but some of different ages run in a long straight line. Although some of the craters contain rocks that have undergone high-pressure shocks characteristic of meteorites slamming into Earth, these shocks could also have been caused by extreme volcanic events.

Conclusion: Craters were probably caused by volcanic events rather than meteorites since the craters are all different ages.

Objective: To find any option the increases the belief that volcanic activity formed the craters.

(A) A similar but shorter line of craters that are all the same age is known to have been caused by volcanic activity.-Incorrect. We are not interested in craters that are all of same age.

(B) No known natural causes would likely account for eight meteorite craters of different ages forming a straight line.-Correct. The option clearly states that there is no known cause for meteorite craters of different ages forming a straight line, strengthening the conclusion that volcanic activity must be the cause.

(C) There is no independent evidence of either meteorites or volcanic activity in the region where the craters are located.-Incorrect. This weakens the conclusion.

(D) There is no independent evidence of a volcanic event strong enough to have created the high-pressure shocks that are characteristic of meteorites slamming into Earth.-Incorrect. This weakens the conclusion.

(E) No known single meteor shower has created exactly eight impact craters that form a straight line.-Incorrect. Just because no known single meteor shower has created exactly eight impact craters that form a straight line, it doesn't mean it will never happen. This doesn't strengthens the conclusion.

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Re: Eight large craters run in a long straight line across a geographical  [#permalink]

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New post 09 Feb 2019, 17:24
Clear B.Other options are not even close.

Some mild argument can be made for E.But meteorite showers are not the same as meteorite.

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Re: Eight large craters run in a long straight line across a geographical   [#permalink] 09 Feb 2019, 17:24
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Eight large craters run in a long straight line across a geographical

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