How are sounds made? A. The sound source causes energy around the ear to compress. B. The sound source causes air particles to circle. C. The sound source causes a chain reaction of vibrations. D. The sound source causes air to be forced into the ear.

Sound is produced when something vibrates. The vibrating body causes the medium (water, air, etc.) around it to vibrate. Vibrations in air are called traveling longitudinal waves, which we can hear. Sound waves consist of areas of high and low pressure called compressions and rarefactions, respectively.