21. Sound waves can't travel through A. a vacuum. B. a solid. C. an elastic material. D. a liquid.

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Sound waves cannot travel through a VACUUM.

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Asked 9/15/2012 3:23:08 PM

Updated 4/27/2014 2:54:27 PM

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Edited by andrewpallarca [4/27/2014 2:54:26 PM], Confirmed by andrewpallarca [4/27/2014 2:54:27 PM]

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