Presentation on theme: "Physical Geology Chapter 11 Part 2 – Mountain Building."— Presentation transcript:
Physical Geology Chapter 11 Part 2 – Mountain Building
Definition A mountain is the most extreme type of deformation Relatively small “wrinkles” in the earth’s crust may soar from 1 to 8 km above sea level A mountain is a piece of land that is higher than a hill and stands much higher than the land around it. Mountains have steep sides and a pointed or rounded top. The top of a mountain is very cold. Mountains are created over long periods of time by tremendous forces of the earth.
Range – a group of adjacent mountains related by shape and structure
Faulted Mountains Vertical movement at fracture zones Tilted blocks, lift or drop at single faults Uplift at double faults Sierra Nevada, Tien Shan, western foothills of the Rockies (Basin/Range region)
Domes and Basins Gentle upwarping or downwarping of crustal rock produce domes and basins Erosion of these structures results in an outcrop pattern that is roughly circular or elongated Black Hills, Adirondacks, Stone Mountain
Volcanic Mountains Eruptions of gases, magma, cinder/ash and pulverized surface material Piles of expelled material form cones that may stand out from surrounding terrain as mountains –Shield cones –Cinder cones –Composite cones