cm, your ears did not plug up. As the pressure changes you have to equalize the pressure on the other side of the ear drum through your Eustachian tubes. Usually a good yawn will do it. Divers know all about it.
Only the speed of sound changes with altitude. Everything else stays relatively the same. In other words there is no difference from a sonic perspective.
Only the speed of sound changes with altitude. Everything else stays relatively the same. In other words there is no difference from a sonic perspective.