1st I am referring to elevation and not height. If I stay to the theme of why I started this thread I would say there are two reasons that Everest would change six feet. I am not saying these are the only reasons, these are the reasons that pertain to the title and O.P. of this thread based on my generalized understanding heh One would be plate tectonics that is currently pushing the mountain range up in relation to the mean sea level. Two would be a rise or drop in the mean sea level.