insulate, stops sound from traveling easily through another material, matter, the material of which all things are made. The 3 forms of matter are solids, liquids, gases, middle ear, a part of the ear inside the head and contains the eardrum and three bones that carry sound waves to the inner ear, nerve, a body part that carries messages to the brain, outer ear, the part of the ear that is outside the head; directs sound waves into the ear canal, pitch, describes whether a note is high or low sound, depending on the number of vibrations, sound waves, the way sound travels, vibration, a quick back-and-forth movement that creates sound, volume, the loudness or softness of a sound, wave, carries energy through a medium, such as sound through air, or light across space, absorb, soak up; something, such as sound waves, cochlea, part of the inner ear that detect sound vibrations and sends information to the brain, conductor, allows sound to travel through something (solid, liquid, gas), decible, a unit for measuring the loudness of sound, ear canal, connects the outer ear to the middle ear; tunnel that sound travels through to the eardrum, ear drum, part of the middle ear that vibrates from sound waves, echo, sound that is reflected from something, so you hear it again, energy, the amount of effort it takes to make something work, frequency, number of waves that pass a particular point in a second, inner ear, the fluid-filled part of the ear that sends messages to the brain

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