Volcano

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NSNguyen: Master | Next Rank: 500 Posts; Posts: 401; Joined: Fri May 04, 2007 9:21 amFollowed by: 1 member; Thanked: 3 times

by NSNguyen » Tue Jul 01, 2008 7:45 am

The largest volcano on Mars rises 26 Kilometers above the surrounding plain and covers an area roughly the size of Romania. Even if the Earth’s gravity were as low as the gravity of Mars, no volcano of such size could exist on Earth, for the Earth’s crust, although of essentially the same composition as that of the Mars, is too thin to support even a small fraction of that mass and would buckle under it, causing the mountain to sink.
If the statements above are true, which of following must also be true on the basis of them?
(A) The surface of Mars is less subject to forces of erosion than is the surface of the Earth.
(B) The highest volcanoes on Mars occur where its crust is thickest.
(C) On average, volcanoes on Mars are higher than those on Earth.
(D) The crust of Mars, at least at certain points on the planet, is thicker than the crust of the Earth.
(E) At least some of Earth’s volcanoes would be larger than they actually are if the Earth’s crust were thicker than it is.

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Source: Beat The GMAT — Critical Reasoning | Tue Jul 01, 2008 7:45 am

Carlo75: Senior | Next Rank: 100 Posts; Posts: 64; Joined: Tue May 13, 2008 12:42 am; Location: Italy; Thanked: 1 times

by Carlo75 » Tue Jul 01, 2008 8:05 am

A through POE.

chidcguy: Master | Next Rank: 500 Posts; Posts: 438; Joined: Mon Feb 12, 2007 9:44 am; Thanked: 26 times

by chidcguy » Tue Jul 01, 2008 11:04 am

To me its A as well.

Please do not post answer along with the Question you post/ask

Let people discuss the Questions with out seeing answers.

senthil: Master | Next Rank: 500 Posts; Posts: 188; Joined: Sun Dec 23, 2007 7:40 am; Location: INDIA; Thanked: 4 times

by senthil » Tue Jul 01, 2008 6:55 pm

i THINK it is D ? wats the OA?

Aldiablo: Senior | Next Rank: 100 Posts; Posts: 76; Joined: Mon Jun 30, 2008 4:31 am; Location: India; Thanked: 2 times

by Aldiablo » Tue Jul 01, 2008 11:43 pm

IMO D.

In A - soil erosion : rogue element.

When you think you can or you cannot, you are generally correct.

suchit: Junior | Next Rank: 30 Posts; Posts: 21; Joined: Sun Jun 22, 2008 1:43 am

by suchit » Wed Jul 02, 2008 12:01 am

I think it is D. What is OA/OE ?

raviagni: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Tue Sep 04, 2007 1:44 pm

by raviagni » Wed Jul 02, 2008 7:38 am

clear D..

We need to see which option is the most politically correct option

NSNguyen: Master | Next Rank: 500 Posts; Posts: 401; Joined: Fri May 04, 2007 9:21 amFollowed by: 1 member; Thanked: 3 times

by NSNguyen » Thu Jul 03, 2008 12:52 am

The OA: D
Cheer

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leswm: Junior | Next Rank: 30 Posts; Posts: 13; Joined: Fri May 04, 2007 10:58 pm

by leswm » Fri Jul 04, 2008 2:59 pm

I would say D.

Largest volcano found in Mars. No such volcano would exist on earth b/c the earth's crust is to thin to support.

(A) The surface of Mars is less subject to forces of erosion than is the surface of the Earth.
No one said anything about erosion.

(B) The highest volcanoes on Mars occur where its crust is thickest.
No one said that either.

(C) On average, volcanoes on Mars are higher than those on Earth.
Didn't cross this out at first. But Mars may only have that one huge volcano and the rest could be smaller. So we can't say for sure that all its volcanoes are on average higher than those of the Earth

(D) The crust of Mars, at least at certain points on the planet, is thicker than the crust of the Earth.
True. If no such volcano can be supported on Earth b/c the crust is too thin, then obviously if it exists in Mars, there must be a spot on Mars that can support that volcano - and that spot has to have thicker crust than that of the Earth.

(E) At least some of Earth’s volcanoes would be larger than they actually are if the Earth’s crust were thicker than it is.
We don't know that for sure, may be and may be not.

peter.p.81: Master | Next Rank: 500 Posts; Posts: 300; Joined: Mon Apr 07, 2014 7:58 am

by peter.p.81 » Wed May 11, 2016 1:06 am

In my opinion A is the most logical one

atrayee345: Senior | Next Rank: 100 Posts; Posts: 32; Joined: Wed Dec 19, 2018 2:58 am

by atrayee345 » Wed Dec 19, 2018 3:05 am

The argument claims that the volcano of such density could not exist on earth despite having gravity as low as that of Mars because of its thin crust. Now, If no such volcano can be supported on Earth because of its thin crust, then there must be a spot on Mars that can support that volcano and that spot has to have thicker crust than that of the Earth. So, D is the answer.

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