The steps below show how the ear processes sound, but they are not in the correct order. Please write the numbers 1 - 4 in front of each step to show proper order of sound processing. [NUMBER] Vibration in the eardrum causes the bones in the middle ear to move back and forth.. [NUMBER] Movement against the oval window causes movement in the fluid that fills the cochlea. [NUMBER] Hairs in the cochlea move and stimulate an impulse along the auditory nerve to the brain. [NUMBER] Sound waves enter the ear and cause vibrations in the eardrum