Propagation, The movement of sound through a medium., Vibration, A rapid back-and-forth movement., Eardrum, A part of the ear that vibrates when sound reaches it., Reflection, The bouncing back of sound from a surface., Echo, A reflected sound heard again., Audible sound, Sound that humans can normally hear, Infrasound, Sound below 20 Hz., Ultrasound, Sound above 20,000 Hz., Medium, A substance through which sound travels.

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