Ok. I've been pondering on this timeless question for a while.
If a tree falls in a forest (or anywhere for that matter) and nobody is around to hear it, does it make a sound?
I'm mad that the mods locked this. Even though it's more science than logic.
I was so vehemently taught in science 8 that sound is not sound when it is without any of these 3 things: a creator, whatever may issue the sound; a medium, the way by which the sound travels; and a receiver, something to "hear" the sound.
If said tree was in a vacuum, or even in an air-filled sphere that was completely soundproof or a distance away from any sentient beings, then no, it would not make a sound. QED.