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# A favored theory to explain the extinction of dinosaurs

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Senior Manager
Joined: 02 Jan 2017
Posts: 307
A favored theory to explain the extinction of dinosaurs  [#permalink]

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Updated on: 05 Oct 2017, 01:41
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Difficulty:

15% (low)

Question Stats:

78% (01:54) correct 22% (02:14) wrong based on 434 sessions

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A favored theory to explain the extinction of dinosaurs, together with many other species, has been the globally catastrophic collision of a large asteroid with the Earth. Supporting evidence is an extraterrestrial chemical element in a layer of dust found worldwide at a geological level laid down contemporaneously with the supported event. A new competing theory contends that any asteroid impact was irrelevant, because it was massive volcanic activity that caused the extinctions by putting enough dust into the atmosphere to cool the planet. The Deccan region of India contains extensive volcanic flows that occurred within the same time period as the supposed asteroid impact and the extinctions.

The new theory assumes that

(A) the massive volcanic activity was not caused by the impact of an asteroid
(B) no individual dinosaurs survived the impact of the asteroid, if it occurred
(C) the extinctions took place over a longer time period than they would have if caused by the impact of an asteroid
(D) other volcanic eruptions were not occurring at the same time as those in the Decean region
(E) it is not possible to determine which would have occurred first, the volcanic flows in the Decean region or the supposed impact of an asteroid

Source: LSAT

Same passage with different stem question: LINK

Originally posted by vikasp99 on 22 Feb 2017, 06:15.
Last edited by broall on 05 Oct 2017, 01:41, edited 2 times in total.
Reformatted question
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Re: A favored theory to explain the extinction of dinosaurs  [#permalink]

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22 Feb 2017, 13:53
The new theory assumes that

(A) the massive volcanic activity was not caused by the impact of an asteroid
(B) no individual dinosaurs survived the impact of the asteroid, if it occurred
(C) the extinctions took place over a longer time period than they would have if caused by the impact of an asteroid
(D) other volcanic eruptions were not occurring at the same time as those in the Decean region
(E) it is not possible to determine which would have occurred first, the volcanic flows in the Decean region or the supposed impact of an asteroid

The alternate theroy provides an alternate reason for the extinction of the dianosours and to provide an alternate reason the theorist whould have to belive and expalin that the two events were not interdependent to each other and the astroid did not cause the eruption of the volcano in this case.If the two are interdependent then the argument would break and the conclusion could not be reached. so we much select a choice that addresses this that the erruption of the volcano was not due to the astroid collision.

Option A is corretly addressing the fact mentioned above and is the correct choice.
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A favored theory to explain the extinction of dinosaurs  [#permalink]

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14 Sep 2018, 11:08
Quote:
A favored theory to explain the extinction of dinosaurs, together with many other species, has been the globally catastrophic collision of a large asteroid with the Earth. Supporting evidence is an extraterrestrial chemical element in a layer of dust found worldwide at a geological level laid down contemporaneously with the supported event. A new competing theory contends that any asteroid impact was irrelevant, because it was massive volcanic activity that caused the extinctions by putting enough dust into the atmosphere to cool the planet. The Deccan region of India contains extensive volcanic flows that occurred within the same time period as the supposed asteroid impact and the extinctions.

The new theory assumes that

(A) the massive volcanic activity was not caused by the impact of an asteroid

(B) no individual dinosaurs survived the impact of the asteroid, if it occurred

(C) the extinctions took place over a longer time period than they would have if caused by the impact of an asteroid

(D) other volcanic eruptions were not occurring at the same time as those in the Deccan region

(E) it is not possible to determine which would have occurred first, the volcanic flows in the Decean region or the supposed impact of an asteroid

A. New theory says extinction had occurred due to volcano, therefore they must have assumed that volcano was

not caused by the impact of asteroid. Otherwise, if they don't assume this, it would be considered that main cause was ASTEROID

IMPACT and VOLCANIC ERUPTIONS was secondary complementary activity.

B,C, D, and E all are irrelevant in context.

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Re: A favored theory to explain the extinction of dinosaurs  [#permalink]

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20 Sep 2018, 02:14
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Hi vikasp99

Conclusion : A new competing theory contends that any asteroid impact was irrelevant.

Volcanic activity caused extinction of dinosaurs and other species and asteroid did not caused any kind of extinction of dinosaurs and other species

Premise : The Deccan region of India contains extensive volcanic flows that occurred within the same time period as the supposed asteroid impact and the extinctions.

Answer choice A is the correct answer choice as it eliminated linking of two theories and if we negate A it falsifies the conclusion that the impact of asteroids is irrelevant.

Now lets look at other answer choices as well

(B) no individual dinosaurs survived the impact of the asteroid, if it occurred -INCORRECT as even if some individual dinosaurs survived the impact of asteroid our conclusion is not impacted
(C) the extinctions took place over a longer time period than they would have if caused by the impact of an asteroid - IRRELEVANT, time period is not what we are concerned with. Our main focus is cause of extinction of dinosaur whether asteroid impact or massive volcanic activity
(D) other volcanic eruptions were not occurring at the same time as those in the Decean region - OUT OF SCOPE, other colcanic eruptions
(E) it is not possible to determine which would have occurred first, the volcanic flows in the Decean region or the supposed impact of an asteroid - INCORRECT as timing of occurence is not what we are concerned with

Kindly give kudos if my explanation helped
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Re: A favored theory to explain the extinction of dinosaurs   [#permalink] 20 Sep 2018, 02:14
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