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Iridium, a hard, whitish metal similar to platinum, is

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Re: Iridium, a hard, whitish metal similar to platinum, is [#permalink] New post 30 Oct 2013, 05:00
I sort of agree with OE.

A is quite opposite of what is stated in the stimulus. Stimulus explicitly states that both volcanic eruptions and meteors are capable producing extremely high concentrations of iridium. A opposes it. Remember we have to accept what is mentioned in the stimulus as a fact and answers negating the fact in stimulus are not good choices. IMHO.

B states that volcanoes erupted frequently 80 million years ago, this implies two scenarios 1) After sometime volcanic eruptions stopped and therefore can not be the reason for dinosaur extinction. 2) The fact the dinosaurs became extinct around 65 million years means that they survived volcanic eruptions that occurred 80 million years ago. With these two one can conclude that dinosaurs continued to exist after volcanic eruptions and there were no volcanic eruptions when dinosaur extinction occurred. This explanation also identifies comet/meteor as the only source of iridium found in rock stratum from 65 million years ago.
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Re: Iridium, a hard, whitish metal similar to platinum, is [#permalink] New post 30 Oct 2013, 18:58
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WaterFlowsUp wrote:
Karishma,

Option B comes somewhat closer, but B has flaws:
1. Do we know when for how long dinosaurs existed?
2. 80m years ago meteoric showers were frequent but is that anyhow supports dinosaurs to be killed?


Most of it is an inference/assumption. Usually a GMAT question would be clearer but the intent of this question is clear to us through our general knowledge. Dinosaurs lived in the Mesozoic era (between 230 and 65 million years ago)

We need to strengthen the theory that meteors caused extinction, that is, volcanoes did not. If massive volcanoes were common at that time, they probably did not cause the wipeout.
(A) tells you that very massive volcanoes are rare but it doesn't say they don't occur. Hence it doesn't say that volcanoes probably did not cause the extinction. In fact, if very massive volcanoes are rare, a rare instance could very well have caused the extinction of the species.
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Re: Iridium, a hard, whitish metal similar to platinum, is [#permalink] New post 24 Nov 2013, 08:11
I agree with retro, B
B is saying that it is less likely that volcanic activities have led to the extinction because these activities have occurred before the extinction.
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Re: Iridium, a hard, whitish metal similar to platinum, is [#permalink] New post 01 Dec 2013, 11:00
B is out. Infact, it is weakening the argument.

Its like , A and B are possible suspects for a murder and the jury has concluded that B is the murderer then suddenly the another lawyer says " no your honor! my client A was also there with the knife. Actually the option B in above case increases uncertainty of the single cause behind the effect and therefore increases the uncertainty of the conclusion hence the argument itself.

Well , yes, between A and C there is an space for debate. First, we have to trust the Experts when they comment as in C case.Second, my preference for A is as because C just repeat the conclusion not adding on to it whereas A add on to the conclusion further. Moreover, as above said, "rare" makes the support variable (from 1% -100%) but here we are providing support not the 100% support.


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Re: Iridium, a hard, whitish metal similar to platinum, is   [#permalink] 01 Dec 2013, 11:00
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