"Propagation" means the process of the wave getting from here to there.
Different is the speed of propagation. Scroll down to related links and look at "Acoustic or sound waves in air - Radio and light waves in a vacuum".
The denser materials carry the sound waves best. For example if we take 2 objects A and B. Of these suppose A is denser then B . Then accordingly speed of sound will be more in A as compared to B. Sound travels in the form of longitudinal waves. So for the propagation of sound waves the atoms of material medium are required. Now if some material has mass density more then other material then definitely the atoms of the material are closer in that substance as compared to other substance. So it will take less energy in the denser medium for the propagation of sound. Therefore it will travel faster in the sound. Hence it is proved that sound travels faster in denser medium.
propagation is the type of how the plant reproduce
there is several ways that waves can move. waves can move by wind. the energy passes to the water causing waves. The better answer. Waves move because they are a movement of energy through a medium. The wave entails two parts, which are the crest and trough. The wavelength is the distance between two crest. The wave height is the distance between a crest and trough.
Modes of Propagation = different ways to continue and/or increase the number of a given species. Example: sexual reproduction.
Mechanical waves require a medium for their propagation whereas electromagnetic waves require a medium for their propagation.
electromagnetic waves do not require medium for their propagation. such as radio waves.
groundwaves line of sight skywaves
Electromagnetic waves do not require medium for propagation.
Rock.
Sound waves are mechanical waves because they require a medium for their propagation .They are also called longitudinal mechanics because they vibrate in the direction of propagation of wave and and produces compression and vibrations like that of longitudinal waves
waves can be described as the pattern of energy propagation through a media.
Wave is a propagation of oscillations of some physical parameter (perturbation of pressure, mass density, electrical or magnetic fields...). If oscillations are perpendicular to the direction of propagation - the wave is transverse (for example - electromagnetic wave). If physical parameter oscillates along the propagation direction - the wave is longitudinal(Sound).
The Earth itself is.
Mechanical waves
Acoustics.
Compression waves, like a shock front.