Electromagnetic waves.
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Propagation medium? Though a wave doesn't need a medium to travel or transfer energy (sound waves do, but lightwaves don't). People used to think there was an ether in which light moved, but there isn't.
Sound waves are not made up of chains and vibrating chains. They are actually longitudinal waves that travel through a medium, such as air or water, caused by the disturbance of particles in that medium. These disturbances create a pattern of compressions (high pressure) and rarefactions (low pressure) that propagate as a wave.
A digital medium.
Waves are typically caused by disturbances or vibrations in a medium, such as water, air, or a solid material. These disturbances create a series of oscillations that propagate through the medium, resulting in the formation of waves.
A medium-sized tephra fragment is typically called lapilli. These fragments are between 2 and 64 mm in size and are formed during explosive volcanic eruptions.