FOLD. It is a very common type of mountain, mostly the largest mountain range is folded mountains and formed over millions of years.Fold mountains are formed when two plates collide head-on, and their edges crumbled, much the same way as a piece of PAPER folds when pushed together.The upward folds are known as anticlines, and the downward folds are synclines.Example: Himalayan Mountains in Asia, the Alps in EUROPE, the Andes in South America, the Rockies in North America, the Urals in Russia.BlockThese mountains form when faults or cracks in the earth's crust force some materials or blocks of rock up and others down.Example: The Sierra Nevada mountain, North America. the Harz Mountains, Germany.PlateauIt is formed by erosion.Plateaus are large flat areas that have been pushed above sea level by forces WITHIN the Earth or have been formed by layers of lava.Example: The mountains, New Zealand.VolcanicIt formed when molten rock (magma) deep within the earth, erupts, and PILES upon the surface.Magna is called lava when it breaks through the earth's crust. When the ash and lava cools, it builds a cone of rock. Rock and lava pile up, layer on top of the layer.Example: Mount St. Helens, North America. Mount Pinatubo, Philippines. Mount Kea and Mount Loa, Hawaii.