Presentation on theme: "Mountain Building. The Himalayas Harz Mountains in Germany."— Presentation transcript:
Harz Mountains in Germany
Catskills of New York
Black Hills of South Dakota
Guess the types of mountains…
So what exactly are the processes that take place to form these mountains? Dome mountains –Magma pushes up but doesn't actually crack through the surface, you can get a dome mountain –Without erupting onto the surface, magma pushes up overlaying rock layers –Cools and forms hardened rock as source moves away –Uplifted area created by rising magma is called a dome –Over long periods of time, erosion wipes away the outer layers of the mountain, exposing the dome- shaped cooled magma of harder rock For a more holistic view of mountains…
So what exactly are the processes that take place to form these mountains? Plateau mountains –Large flat areas pushed above sea level by forces within the Earth or formed by layers of lava –Plateau mountains are often found near folded mountains –As years pass, streams and rivers erode valleys through the plateau For a more holistic view of mountains…
So what exactly are the processes that take place to form these mountains? Volcanic mountains –Self-explanatory! –More details in the future lessons!
Mountain Building 3 stages (1)accumulation of sediments (2)rock deformation and crustal uplift (3)a period of crustal uplift caused by isostatic rebound and block-faulting
Stage 2: Rock Deformation and Crustal Uplift Fold mountains –Fold mountains are formed when two plates collide head on –Edges of each tectonic plate crumple and buckle –Monocline, syncline, anticline, http://www.physicalgeography.net/fundamentals/10k.html
Stage 3: Crustal Uplift caused by Isostatic Rebound and Block-Faulting http://www.physicalgeography.net/fundamentals/10k.html
Stage 3: Crustal Uplift caused by Isostatic Rebound and Block-Faulting Fault-block mountains –Faults named according to type of stress that acting on rock and nature of the movement of the rock blocks either side of the fault plane Normal (tensional) Reverse (compressional) Graben (tensional, subsidence) Horst (compressional, uplift) Transform What landform does faulting remind you of?