Sound that bounces back is called an echo and they are formed when sound waves are called a bellend.
1. Sound travels in waves
2. These waves bounce of nearly everything
3. Sometimes these waves get absorbed or run out of energy
4. If you are in a big room/place with nothing in these sound waves bounce around and end up coming back to your ears!
Sound echoes off of virtually everything, but the echoes are usually too scattered or diminished to be heard. The shape of deep valleys allows echoes to reflect off the valley walls and back to you without being diminished too much. (There are some blind people who have trained themselves to know the proximity of nearby objects through echo location, similar to the way bats do.)
Reflection.
It bounces back; echoes.
This is probably Echo.
reflection
Toyota makes them in factories.
The Echoes was created in 1959.
The plural form is echoes. The plural possessive is echoes'.
Echoes of Refuge was created in 2006.
Echoes of Honor was created in 1998.
Eternal Echoes was created in 2001.
Echoes from the Ocean was created in 1999.
Imperial Echoes was created in 1928.
Echoes of Eternity was created in 2005.
Echoes of an Era was created in 1981.
Echoes in the Darkness was created in 1987.
Echoes of Service was created in 1872.