An example of a varying sound would be:

A varying sound is characterized by changes in pitch, loudness, or quality over time, making it distinct from more static sounds. Grinding stands out as a prime example because it typically involves fluctuations in intensity and tonal quality as materials rub against each other, creating a complex sound profile that can change in texture and volume.

In contrast, explosive noise tends to be a singular, impactful sound often defined by its intensity rather than variation. Low rumble focuses on more consistent, lower-frequency sounds that do not typically undergo significant changes during their duration. Similarly, a high-frequency beep is often a steady tone that lacks variation in sound characteristics, making it more consistent rather than fluctuating. Thus, grinding captures the essence of varying sounds more effectively than the other examples.