There is no real alternative to asking god how he did it.
But I can't help believing it is asking a lot.
I can't believe nobody has asked him until now. …
How did you build / are you building the mountains?
Can you please tell us as we would like to know.
Yours sincerely -on behalf of earthlings everywhere.
There. That should do it.
In the meantime; here is what's online:
Some of the major mountain belts on the Earth are the North American Cordillera (A), Appalachians (B), Caledonian Belt (C), Andes (D), Urals (E), Himalaya (F), Alps (G), and the Tasman Belt (H). (Source of Modified Image: NOAA, National Geophysical Data Center).
It's a badly laid out site according to the net watch-dogs. Nothing horrid on it just poor web design:
I opened it in Firefox but will have to read it in Opera as it can increase and lower the magnification so much better. Though the Ctrl & – does the trick.