Sound waves are mechanical waves that require a medium for propagation. In the atmosphere, sound waves are transmitted through molecular collisions, where the energy of the wave is transferred from one molecule to another.

The speed of sound in a gas is proportional to the square root of its absolute temperature. Therefore, the speed of sound in the atmosphere increases with increasing temperature.

Refraction is the bending of sound waves due to changes in the density of the medium. In the atmosphere, sound waves are refracted due to variations in temperature and wind speed.

Superrefraction occurs when sound waves are refracted upward due to a strong temperature gradient in the atmosphere. This can result in the trapping of sound waves within a layer of the atmosphere, leading to long-distance propagation.

Molecular relaxation is the process by which molecules return to their equilibrium state after being disturbed by a sound wave. This process results in the conversion of sound energy into heat.

An echo is a reflection of a sound wave from a surface. When sound waves encounter the ground, they are reflected back towards the source, creating an echo.

Scattering is the process by which sound waves are redirected in different directions due to interactions with small particles, such as dust, water droplets, and ice crystals.

Focusing occurs when sound waves are concentrated at a specific point or region due to the curvature of a surface. This can result in the amplification of sound waves.

Sound channeling occurs when sound waves are trapped within a layer of the atmosphere due to a strong temperature gradient. This can result in the long-distance propagation of sound waves.

Ground absorption is the process by which sound waves are absorbed by the ground. This is due to the conversion of sound energy into heat through interactions with the ground surface.

Vegetation absorption is the process by which sound waves are absorbed by vegetation. This is due to the conversion of sound energy into heat through interactions with leaves, branches, and stems.

Precipitation absorption is the process by which sound waves are absorbed by precipitation, such as rain, snow, and hail. This is due to the conversion of sound energy into heat through interactions with water droplets and ice crystals.

Turbulence absorption is the process by which sound waves are absorbed by turbulence in the atmosphere. This is due to the conversion of sound energy into heat through interactions with eddies and other turbulent structures.

Molecular relaxation absorption is the process by which sound waves are absorbed by molecular relaxation in the atmosphere. This is due to the conversion of sound energy into heat through interactions with molecules.