sentence: All sounds are made by vibrations of molecules through which the sound travels.
sentences_after: For instance, when a drum or a cymbal is struck, the object vibrates. These vibrations make air molecules move. When the vibrating air molecules reach our ears, the eardrum vibrates, too. The bones of the ear vibrate in the same way that of the object that started the sound wave. These vibrations let you hear different sounds.
concept_name: sound
headings: Sound
categories: Basic English 850 words