GMAT
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, traveling most rapidly through cold, dense regions and more slowly through hotter rocks.
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 and most rapidly travel through cold, dense regions, and slower through hotter rocks.
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