This causes the sound wave to travel faster in the upper region resulting in refraction of the sound towards (along) the ground.
(the upper region; resulting; in refraction of the sound towards (along) the ground) (This; causes; the sound wave to travel faster in the upper region) Context(This causes,List([0, 11))):(the sound wave; to travel faster; in the upper region)
This causes,List([0, 11))
the upper region This the sound wave
resulting causes to travel faster
in refraction of the sound towards (along) the ground
the sound wave to travel faster in the upper region
in the upper region