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Climatologists believe they know why Earth has undergone a

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New post 04 May 2017, 14:13
I hope below explanation would help people having doubts over why D is the correct answer:

Para concludes that Cosmic Dust causes earth temperature to drop.
But D says Large Cosmic Rock (maybe large asteroids which killed dinosaur's) impact caused earth dust to cover earth resulting in Earth temperature drop.
So it actually weakens the conclusion because it says earth dust not cosmic dust caused it.
We neglected this because cosmic dust and cosmic rock sounds similar.
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New post 05 Nov 2018, 13:14
How is “earth passing through the clouds of cosmic dust” as given in the argument different from “large bits of cosmic rock periodically entering the earth’s atmosphere” as given in option D??

I do understand why option C cannot be considered the answer to this question as it says, “ the temperature drops *slightly* post volcanic eruptions.

That leaves us with choice A, which obviously isn’t related to the “hypothesis” mentioned in the argument.

I am still confused between A and D.

Please help! Thanks in advance!

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New post 06 Nov 2018, 22:18
Option C cannot be the answer because it tells us that volcanic dust only reduces the temperature slightly, not enough to cause an ice age. This assures that ice age is not caused by volcanic dust, thereby supporting the conclusion that ice age is caused by cosmic dust.
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New post 13 Feb 2019, 06:38
I had difficulties choosing between C and D.

In my understanding the original statement addresses "cosmic" dust whereas C talks about "atmospheric" dust, hence the two things would be unrelated...
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New post 27 Mar 2019, 03:09
vjsharma25 wrote:
Climatologists believe they know why Earth has undergone a regular sequence of ice ages beginning around 800,000 years ago. Calculations show that Earth’s orbit around the Sun has fluctuations that coincide with the ice-age cycles. The climatologists hypothesize that when the fluctuations occur, Earth passes through clouds of cosmic dust that enters the atmosphere; the cosmic dust thereby dims the Sun, resulting in an ice age. They concede, however, that though cosmic dust clouds are common, the clouds would have to be particularly dense in order to have this effect.

Each of the following, if true, would lend support to the climatologists’ hypothesis EXCEPT:

(A) Earth did not pass through clouds of cosmic dust earlier than 800,000 years ago.
(B) Two large asteroids collided 800,000 years ago, producing a tremendous amount of dense cosmic dust that continues to orbit the Sun.
(C) Earth’s average temperature drops slightly shortly after volcanic eruptions spew large amounts of dust into Earth’s atmosphere.
(D) Large bits of cosmic rock periodically enter Earth’s atmosphere, raising large amounts of dust from Earth’s surface.
(E) Rare trace elements known to be prevalent in cosmic debris have been discovered in layers of sediment whose ages correspond very closely to the occurrence of ice ages.

Source : LSAT PrepTest 44, Q17



VeritasKarishma : Please help to clarify between C and D.

Can a slight edge of one option over the other be a reason of eliminating one and keeping the other.

Or we need some significant difference/s to choose between right and wrong.
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New post 27 Mar 2019, 04:58
Quote:
Please help to clarify between C and D.

Can a slight edge of one option over the other be a reason of eliminating one and keeping the other.

Or we need some significant difference/s to choose between right and wrong.


In my view, Option C do lend some support in Climatologists conclusion, as option states that due to dust temperature could drop(even slightly).

Whereas option D, just states a phenomena with no co-relation to Climatologists hypothesis either for or against.
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Re: Climatologists believe they know why Earth has undergone a  [#permalink]

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New post 28 Mar 2019, 00:15
vjsharma25 wrote:
Climatologists believe they know why Earth has undergone a regular sequence of ice ages beginning around 800,000 years ago. Calculations show that Earth’s orbit around the Sun has fluctuations that coincide with the ice-age cycles. The climatologists hypothesize that when the fluctuations occur, Earth passes through clouds of cosmic dust that enters the atmosphere; the cosmic dust thereby dims the Sun, resulting in an ice age. They concede, however, that though cosmic dust clouds are common, the clouds would have to be particularly dense in order to have this effect.

Each of the following, if true, would lend support to the climatologists’ hypothesis EXCEPT:

(A) Earth did not pass through clouds of cosmic dust earlier than 800,000 years ago.
(B) Two large asteroids collided 800,000 years ago, producing a tremendous amount of dense cosmic dust that continues to orbit the Sun.
(C) Earth’s average temperature drops slightly shortly after volcanic eruptions spew large amounts of dust into Earth’s atmosphere.
(D) Large bits of cosmic rock periodically enter Earth’s atmosphere, raising large amounts of dust from Earth’s surface.
(E) Rare trace elements known to be prevalent in cosmic debris have been discovered in layers of sediment whose ages correspond very closely to the occurrence of ice ages.

Source : LSAT PrepTest 44, Q17


Ice ages began 800,000 years ago.
Earth’s orbit around the Sun has fluctuations that coincide with the ice-age cycles.

Hypothesis: When the fluctuations occur, Earth passes through clouds of cosmic dust that enters the atmosphere; the cosmic dust thereby dims the Sun, resulting in an ice age.
Though cosmic dust clouds are common, the clouds would have to be particularly dense in order to have this effect.

Climatologists’ hypothesis is regarding cosmic dust causing ice ages beginning 800,000 years ago.

Which of the following does not support the hypothesis?

(A) Earth did not pass through clouds of cosmic dust earlier than 800,000 years ago.
Helps establish link between ice age and cosmic dust. Ice ages started 800,000 years ago. So did cosmic dust clouds.

(B) Two large asteroids collided 800,000 years ago, producing a tremendous amount of dense cosmic dust that continues to orbit the Sun.
Again, helps establish link between ice age and cosmic dust. Ice ages started 800,000 years ago. So did cosmic dust clouds.

(C) Earth’s average temperature drops slightly shortly after volcanic eruptions spew large amounts of dust into Earth’s atmosphere.
Helps establish that dust clouds can cause lowering of temperature. So if clouds are thick enough, sun may get blocked and result in massive temperature drop causing ice ages.

(D) Large bits of cosmic rock periodically enter Earth’s atmosphere, raising large amounts of dust from Earth’s surface.
This only says that periodically, dust enters Earth's atmosphere. What impact it has, we don't know. Does it lower temperature periodically, it is not mentioned so it doesn't support our hypothesis. Does it have no impact? If so, our hypothesis may become less likely.
Hence, (D) does not support our hypothesis.

(E) Rare trace elements known to be prevalent in cosmic debris have been discovered in layers of sediment whose ages correspond very closely to the occurrence of ice ages.
It links cosmic dust to ice ages. Supports our hypothesis.

Answer (D)
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New post 28 Mar 2019, 00:18
AkshdeepS wrote:
vjsharma25 wrote:
Climatologists believe they know why Earth has undergone a regular sequence of ice ages beginning around 800,000 years ago. Calculations show that Earth’s orbit around the Sun has fluctuations that coincide with the ice-age cycles. The climatologists hypothesize that when the fluctuations occur, Earth passes through clouds of cosmic dust that enters the atmosphere; the cosmic dust thereby dims the Sun, resulting in an ice age. They concede, however, that though cosmic dust clouds are common, the clouds would have to be particularly dense in order to have this effect.

Each of the following, if true, would lend support to the climatologists’ hypothesis EXCEPT:

(A) Earth did not pass through clouds of cosmic dust earlier than 800,000 years ago.
(B) Two large asteroids collided 800,000 years ago, producing a tremendous amount of dense cosmic dust that continues to orbit the Sun.
(C) Earth’s average temperature drops slightly shortly after volcanic eruptions spew large amounts of dust into Earth’s atmosphere.
(D) Large bits of cosmic rock periodically enter Earth’s atmosphere, raising large amounts of dust from Earth’s surface.
(E) Rare trace elements known to be prevalent in cosmic debris have been discovered in layers of sediment whose ages correspond very closely to the occurrence of ice ages.

Source : LSAT PrepTest 44, Q17



VeritasKarishma : Please help to clarify between C and D.

Can a slight edge of one option over the other be a reason of eliminating one and keeping the other.

Or we need some significant difference/s to choose between right and wrong.


It isn't about slight edge. It is about only one correct option. Though we do talk about "best option" in Verbal questions, it's mostly relevant for SC and RC questions.
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New post 28 Mar 2019, 01:29
Each of the options except D talks about changes in temperature and/or the ice age cycle that would support the argument.

C suggests that dust causes the earth's temperature to drop, which supports the position that cosmic dust could have a similar impact of reducing earth's temperature.

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Climatologists believe they know why Earth has undergone a   [#permalink] 28 Mar 2019, 01:29

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