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A favored theory to explain the extinction

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A favored theory to explain the extinction [#permalink]

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New post 05 Oct 2017, 01:41
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  55% (hard)

Question Stats:

60% (02:53) correct 40% (02:03) wrong based on 57 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.

Which one of the following, if true, most strongly indicates that the asteroid-impact theory is at least incomplete, if not false?

(A) Large concentrations of dinosaur nests with fossil eggs found in Alberta indicate that at least some species of dinosaurs congregated in large groups during some part of their lives.

(B) Dinosaur remains indicate that some species of dinosaur could have migrated in herds over wide ranges, so that they could have traveled to escape the local effects of certain catastrophes.

(C) Legends from many cultures, such as the Greek legend that Cadmus raised an army by sowing dragons’ teeth in the ground, show that various ancient peoples worldwide were familiar with the fossils of dinosaurs.

(D) In the Gobi desert in China, where now only small animals can eke out an existence, fossil dinosaur skeletons 27 feet long were found in circumstances indicating that the climate there was as dry when the dinosaurs lived as it is now.

(E) The fossil record in Montana from below the layer of extraterrestrial dust shows a diminution over time in dinosaur species from 35 to 13, and dinosaur teeth found above the dust layer show a diminution in species from 13 to 5.

Source: LSAT

Same passage with different stem question: LINK
[Reveal] Spoiler: OA

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

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New post 05 Oct 2017, 02:07
By POE , I will go with E ..As the fossil record is found both top and below the extraterrestrial dust, it strengthens the point that there may be some other catastrophic event that led animal extinction ..

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

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New post 18 Nov 2017, 07:52
broall wrote:
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.

Which one of the following, if true, most strongly indicates that the asteroid-impact theory is at least incomplete, if not false?

(A) Large concentrations of dinosaur nests with fossil eggs found in Alberta indicate that at least some species of dinosaurs congregated in large groups during some part of their lives.

(B) Dinosaur remains indicate that some species of dinosaur could have migrated in herds over wide ranges, so that they could have traveled to escape the local effects of certain catastrophes.

(C) Legends from many cultures, such as the Greek legend that Cadmus raised an army by sowing dragons’ teeth in the ground, show that various ancient peoples worldwide were familiar with the fossils of dinosaurs.

(D) In the Gobi desert in China, where now only small animals can eke out an existence, fossil dinosaur skeletons 27 feet long were found in circumstances indicating that the climate there was as dry when the dinosaurs lived as it is now.

(E) The fossil record in Montana from below the layer of extraterrestrial dust shows a diminution over time in dinosaur species from 35 to 13, and dinosaur teeth found above the dust layer show a diminution in species from 13 to 5.

Source: LSAT

Same passage with different stem question: LINK


Hi Broall,
Can u kindly explain option E. I felt Option D somehow suggests volcanic activity is not the reason. As the region is almost as dry now as it was earlier, and so there is no cooling effect and thus we cant ignore the asteroid theory.

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A favored theory to explain the extinction [#permalink]

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New post 18 Nov 2017, 08:37
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Clearly E.
Only E provides support to both the theories without refuting one. D refutes the second theory(dust has resulted in cooling of the planet) stating that the temperature hasn't changed.
E provides evidence that both the theories have impacted in extinction because the fossil both above and below the extraterrestrial dust layer shows diminution.
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A favored theory to explain the extinction   [#permalink] 18 Nov 2017, 08:37
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