That the speed of wind is taken to be negligible.
Reflection.
It bounces back; echoes.
This is probably Echo.
cliff is an open area so when we shout the sound goes echoes
reflection
Echoes means the repetition of a sound caused by the refection of sound and waves.
Reverberations.
Echoes of sound and images in a mirror involves sound waves and light waves respectively being reflected off a surface.
Sonar uses echoes to locate objects by bouncing sound waves off them and detecting the echoes.
its reverberation
Echoes
They HEAR using their ears but they use the echoes of the sounds they make to build a "sound picture" of their surroundings. This is used to avoid collisions and to catch prey. This use of sound and echoes is called "echo location".
The word you want is reverb.
Reflection.
It bounces back; echoes.
cause the sound bounces off other mountains and you hear the echoes.
Repeated echoes are called reverberations. They occur when sound waves reflect off surfaces multiple times, creating a persistence of sound in a space.