o·rog·e·ny 
(ô-rŏjə-nē) also or·o·gen·e·sis (ôr′ə-jĕnĭ-sĭs)
(ô-rŏjə-nē) also or·o·gen·e·sis (ôr′ə-jĕnĭ-sĭs)n.
The process of mountain formation, especially by a folding and faulting of the earth's crust.
or′o·genic (ôr′ə-jĕnĭk) adj.
or′o·geni·cal·ly adv.