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# Planetary bodies differ from one another in their

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Director
Joined: 29 Jul 2006
Posts: 728
Planetary bodies differ from one another in their  [#permalink]

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15 Jul 2007, 01:14
5
6
00:00

Difficulty:

85% (hard)

Question Stats:

55% (02:28) correct 45% (02:42) wrong based on 281 sessions

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Planetary bodies differ from one another in their composition, but most of those in the Solar System have solid surfaces. Unless the core of such a planetary body generates enough heat to cause volcanic action, the surface of the body will not be renewed for millions of years. Any planetary body with a solid surface whose surface is not renewed for millions of years becomes heavily pockmarked by meteorite craters, just like the Earth’s Moon. Some old planetary bodies in the Solar System, such as Europa, a very cold moon belonging to Jupiter, have solid icy surfaces with very few meteorite craters.

If the claims above are true, which one of the following must, on the basis of them, be true?
(A) The Earth’s Moon does not have an icy surface.
(B) If a planetary body does not have a heavily pockmarked surface, its core does not generate enough heat to cause volcanic action.
(C) Some planetary bodies whose cores generate enough heat to cause volcanic action do not have solid icy surfaces.
(D) Some of Jupiter’s moons are heavily pockmarked by meteorite craters.
(E) Some very cold planetary bodies have cores that generate enough heat to cause volcanic action.

Director
Joined: 06 Sep 2006
Posts: 639
Re: Planetary bodies differ from one another in their  [#permalink]

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15 Jul 2007, 07:27
Between C and E.
C says if X leads to Y then Y should lead to X. Not alwyas true. So C is out.
E is what I pick.
Manager
Joined: 24 Jun 2006
Posts: 121
Re: Planetary bodies differ from one another in their  [#permalink]

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15 Jul 2007, 08:04
i go for E
the stem clearly state on the basis of them"the claims"
looking at answer choices between E and C
only E can be based entirely on those claims.
Claims never talked about some volcanic bodies that do not have ice surface. But about a relation between volcanic activity and craters, here is hour link with answer E...since this icy planet has few craters then based on the claims it must have some volcanic activity thus...
Some Icy planet have volcanic activity
Hence E
Senior Manager
Joined: 28 Jun 2007
Posts: 282
Re: Planetary bodies differ from one another in their  [#permalink]

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16 Jul 2007, 09:19
boubi wrote:
i go for E
the stem clearly state on the basis of them"the claims"
looking at answer choices between E and C
only E can be based entirely on those claims.
Claims never talked about some volcanic bodies that do not have ice surface. But about a relation between volcanic activity and craters, here is hour link with answer E...since this icy planet has few craters then based on the claims it must have some volcanic activity thus...
Some Icy planet have volcanic activity
Hence E

My choice is E for the same reasons.
Director
Joined: 29 Jul 2006
Posts: 728
Re: Planetary bodies differ from one another in their  [#permalink]

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16 Jul 2007, 09:30
boubi wrote:
i go for E
the stem clearly state on the basis of them"the claims"
looking at answer choices between E and C
only E can be based entirely on those claims.
Claims never talked about some volcanic bodies that do not have ice surface. But about a relation between volcanic activity and craters, here is hour link with answer E...since this icy planet has few craters then based on the claims it must have some volcanic activity thus...
Some Icy planet have volcanic activity
Hence E

Thanks...Great Explanation!!!...OA is E.
Manager
Joined: 14 May 2017
Posts: 53
Location: India
GPA: 3.5
Re: Planetary bodies differ from one another in their  [#permalink]

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28 Dec 2017, 06:24
A. No. Nothing of that sort is mentioned in the passage. The passage only states that Europa has an icy surface. Doesn’t mention anything about the surface of the moon as such.
B. Very narrow. We can't say for sure. There could be a variety of other reasons.
D.This claims the opposite of what the passage says.

E. Yes. Correct choice. Clue: Last line of the passage.
Senior Manager
Joined: 02 Apr 2014
Posts: 477
Location: India
Schools: XLRI"20
GMAT 1: 700 Q50 V34
GPA: 3.5
Re: Planetary bodies differ from one another in their  [#permalink]

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28 Dec 2017, 10:38
ContraPositive into play => E

if not enough heat to cause volcanic action(A) -> the surface of the body will not be renewed for millions of years(B) -> heavily pockmarked by meteorite craters (C)

contrapositive: ~C -> ~B -> ~A

Premise: Europa, a very cold moon belonging to Jupiter, have solid icy surfaces with very few meteorite craters (~C) - negation of heavily pockmarked by meteorite creaters

~C -> ~A => Europa (very cold) with very few metorite craters (~C) -> enough heat to cause valconic action (~A) (negation of not enough heat to cause valconic action)

Answer E captures the above contrapositive nicely, by saying some very cold planetary bodies (Europa) has enough heat to cause valconic action
Re: Planetary bodies differ from one another in their   [#permalink] 28 Dec 2017, 10:38
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