per wiki, Acoustic absorption refers to
the process by which a material, structure, or object takes in sound energy when sound waves are encountered, as opposed to reflecting the energy. Part of the absorbed energy is transformed into heat and part is transmitted through the absorbing body. The energy transformed into heat is said to have been 'lost'.
There are 3 possibilities in total, namely, reflecting + transformed into heat + transmitted through the absorbing body. Is this a complete list of phenomena that sound wave would encounter during travelling？In other words, is there any other phenomena that sound wave would encounter during travelling？
how about travelling itself, such as the enerny causing the movement of air molecules to carrying to sound wave?