Examlex
Which of the following does not contribute to ozone depletion?
Ultrasonic Sounds
Sounds that have frequencies above the upper limit of human hearing, typically greater than 20,000 Hz.
Music
An art form consisting of sequences of sounds in time, typically employing melody, harmony, rhythm, and timbre.
Pain Relief
The act or an instance of reducing or eliminating discomfort or distress in the body.
Unpleasant Events
Occurrences that cause discomfort, distress, or unhappiness to an individual or group.
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