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Source: Official Guide for the GMAT 13th Ed. Sentence Correction; #121 Official Guide for the GMAT 2015 14th Ed. Sentence Correction; #121

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New theories propose that catastrophic impacts of

New theories propose that catastrophic impacts of asteroids and comets may have cause reversals in the Earth's magnetic field, the onset of ice ages, splitting apart continents 80 million years ago, and great volcanic eruptions.

2 Explanations

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Luis Alania

are action nouns same as gerunds? thanks!

Sep 9, 2016 • Comment

Cydney Seigerman, Magoosh Tutor

Hi Luis! Yes, gerunds are the noun forms of verbs or, to phrase that another way, action nouns :)

Sep 12, 2016 • Reply

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Gravatar Mike McGarry, Magoosh Tutor

May 25, 2013 • Comment

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Section 9.6 Sentence Correction

Section 9.6 Sentence Correction

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