The first set of waves to arrive are the waves which are due to compression--vibrations in the direction in which the waves are produced--and correspond to sound waves.
(The first set of waves; are; the waves which are due to compression--vibrations in the direction in which the waves are produced--and correspond to sound waves) (the waves; are; due to compression--vibrations in the direction in which the waves are produced--and correspond to sound waves) (the waves; are produced; L:the direction)
The first set of waves the waves the waves
are are are produced
the waves which are due to compression--vibrations in the direction in which the waves are produced--and correspond to sound waves
due to compression--vibrations in the direction in which the waves are produced--and correspond to sound waves
L:the direction