- Two continental crusts collide and as neither can sink, they are forced up into Fold Mountains. The Indian plate collided with the Eurasian plate forming the Himalayas.
- The Himalayas are constantly changing, because these highly folded and faulted regions do not become seismically quiet after first impact.
- At this extreme altitude weathering and erosions reduce mountain height, but Isostatic lift in some areas, produced by continuing plate motion, means that some scientists believe that Everest is increasing in height by up to 2.5cm per year.
- The whole region experiences earthquakes as Pakistan in 2005 and Sichuan in China 2008 did.
