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Types of Mountains Type of Mountain Picture Description/Explanation Folded Mountains Folded mountains are formed when the layers of rocks are folded like a rug that has been pushed up against a wall. Fault Block Mountains Formed from the tremendous forces inside Earth squeeze horizontal rock layers, causing them to fold. Fault-block mountains are formed from huge blocks of rock that are separated from surrounding rocks by faults. Upwarped Mountains The faults are large fractures in rocks along which mostly vertical movement occurs. Upwarped mountains form when blocks of Earth’s crust are pushed up by forces inside the Earth. Volcanic Mountains Over time, the soil and sedimentary rock at the top of Earth’s crust erode. Volcanic mountains form from molten material reaches the surface through a week area in the crust. Examples Appalachian Mountains Rocky Mountains in Canada The Grand Tetons of Wyoming Sierra Nevada in California The deposited materials pile up layer upon layer until a coneshaped structure forms. Adirondack Mountains in New York Rocky Mountains in Colorado and New Mexico Black Hills in South Dakota Mount St. Helens in Washington Mount Shasta in California Hawaiian Islands