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# Geologists believe that the warning signs for a major

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Senior Manager
Joined: 10 Mar 2008
Posts: 343
Geologists believe that the warning signs for a major [#permalink]

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05 Oct 2008, 19:13
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Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth’s crust, changing the measured stain across a fault zone, and varying the electrical properties of underground rocks.

(A) changing the measured strain across a fault zone, and varying
(B) changing measurements of the strain across a fault zone, and varying
(C) changing the strain as measured across a fault zone, and variations of
(D) changes in the measured strain across a fault zone, and variations in
(E) changes in measurements of the strain across a fault zone, and variations among

As per OG, in the original sentence changing and varying are used as verbs rather than nouns. I dont understand how that is true because an ing form needs to be preceded by a 'to be' verb to qualify as a verb. Am I missing something? Could someone please correct me. Thanks!
Intern
Joined: 17 Oct 2007
Posts: 39

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05 Oct 2008, 21:45
IMO, it is E. Changes in measurement seems most logical as opposed to measured strain.
Manager
Joined: 04 Sep 2007
Posts: 208

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05 Oct 2008, 21:58
vksunder wrote:
Geologists believe that the warning signs for a major earthquake may include sudden fluctuations in local seismic activity, tilting and other deformations of the Earth’s crust, changing the measured stain across a fault zone, and varying the electrical properties of underground rocks.

(A) changing the measured strain across a fault zone, and varying
(B) changing measurements of the strain across a fault zone, and varying
(C) changing the strain as measured across a fault zone, and variations of
(D) changes in the measured strain across a fault zone, and variations in
(E) changes in measurements of the strain across a fault zone, and variations among

As per OG, in the original sentence changing and varying are used as verbs rather than nouns. I dont understand how that is true because an ing form needs to be preceded by a 'to be' verb to qualify as a verb. Am I missing something? Could someone please correct me. Thanks!

I'd pick D. For a better explanation, you may want to look at this:
http://www.urch.com/forums/gmat-sentence-correction/97221-geologists-believe.html
Manager
Joined: 25 May 2008
Posts: 186

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06 Oct 2008, 06:12
I was in doubt between D and E, but the link was useful and i chose D.
Re: SC: Geologists   [#permalink] 06 Oct 2008, 06:12
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