which term describes an area of low density in a longitude wave A. compression B. crest C. trough D. rarefaction​

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The answer is option d) Rarefaction. Low density is an area of rarefaction.

Explanation:

Rarefaction is the reduction of an item's density, the opposite of compression. Like compression, which can travel in waves (sound waves, for instance), rarefaction waves also exist in nature.

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