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A space with no air or matter
Vacuum
A vibration that travels through a medium, like air, carrying sound.
Sound wave
The distance between two similar points in a wave, like from one crest to the next.
Wavelength
The height of a wave, which determines its strength or loudness.
Amplitude
The amount of sound produced, or how loud or soft it is.
Volume
A unit used to measure the intensity or loudness of sound.
Decibel
A rapid back-and-forth movement that creates sound.
Vibration
A reflected sound wave that you hear after the original sound.
Echo
A spiral-shaped part of the ear that converts sound vibrations into nerve signals.
Cochlea
A thin membrane in the ear that vibrates in response to sound.
Eardrum
The nerve that carries sound signals from the ear to the brain.
Auditory nerve
The outer part of the ear that collects sound.
Pinna
The bouncing back of a wave when it hits a surface.
Reflection
The bending of a wave as it passes from one medium to another.
Refraction
To take in or soak up energy, like sound or light.
Absorb
The clear, outer layer of the eye that helps focus light.
Cornea
