10. OROGENESIS : describes process of mountain building. the processes that 1o the land surface in <50 million years. The processes that produce mountain belts is called orogenesis. Orogeny is an ongoing process an last for tens of milions or years. when uplift ceases, erosive forces planes the mountains back ar The active mountain chains as indicated by the occurrence of earthquakes. Alpine and Himalayan orogeny occurs where a block of Continental crust is carried into collision with other crustal plates. But most active mountain chains lie on continental plates in collision with oceanic crust.