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[blackshirtboy]

Originally Posted by arctic eagle

unobtanium, you know, the grey rock, if you paid attention, you'd lean there's more to pandora than you think, skxawng Tawtute

Well I assume you're talking about "the flux", the strange distortion that envelops the hallelujah mountains. Persumably it refers to some sort of "gravitational flux" where either gravity is at its weakest point or a large deposit of unobtanium pushes the land upwards.
HOWEVER!
The natural gravity thing makes no sense because then why don't people just fly off into space when they get too close, and we are never told anything about unobtanium other than how much it sells for. For all we know it's being ground up and used as a sweetener for coffee back on Earth, we're certainly not led to believe that it makes things float.
AND!
Neither of those explanations excuse the waterfalls.

Also, I absolutely loved the movie and the mountains were the only part I had any real trouble with, and that isn't saying much, my earlier post made me out to seem angrier about it than I was. In hindsight I shouldn't have unleashed the awesome power of capslock.