Source: Official Guide for GMAT Review 2016 Sentence Correction; #86

5

To map Earth’s interior, geologists use a

To map Earth’s interior, geologists use a network of seismometers to chart seismic waves that originate in the earth’s crust and ricochet around its interior, most rapidly traveling through cold, dense regions and slower through hotter rocks.

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Section 9.6 Sentence Correction

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