How do the following processes occur? (AS 1)

The sound waves, collected by the pinna are changed as vibrations.

The sound waves enter the through the pinna (outer ear) and travel to the ear drum through the ear canal. These waves create pressure which vibrate the tympanum, and the vibrations are then sent to the tiny bones (ossicles) of the middle ear. These bones amplify the vibrations and send them to the inner ear which thereby vibrates the tiny hair cells in the cochlea at certain frequencies and the sound is then interpreted by the brain.