stanleygao wrote:
Second sentence: its acoustic energy prevented from dissipating by boundaries in the ocean created by water layers of different temperatures and densities.
Hi stanleygao, this structure is calledabsolute modifier and is just aphrase (not a clause/sentence). The structure of anabsolute modifier typicallyis:
Noun (its acoustic energy) +Noun modifier (prevented from dissipating....).
Absolute modifiers are quite frequently tested on GMAT and so, test takers need to make themselves comfortable
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