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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Ainterior, most rapidly traveling through cold, dense regions and slower
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Binterior, which travel most rapidly through cold, dense regions, and more slowly
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Cinterior, traveling most rapidly through cold, dense regions and more slowly
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Dinterior and most rapidly travel through cold, dense regions, and slower
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Einterior and that travel most rapidly through cold, dense regions and slower
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正确答案: C