20.3 – Other Types of Mountain Building

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Presentation transcript:

20.3 – Other Types of Mountain Building

Divergent Mountains An ocean ridge is broad and high that forms as lithosphere bulges upward due to an increase in temperature along a divergent boundary

Uplifted Mountains Formed when large regions of earth have been slowing uplifted as a unit Less deformation

Hypothesis of Uplifted Mountains part of the lithosphere made of mantle rocks becomes cold and dense enough that it sinks into the underlying mantle and is replaced by hotter and less dense mantle The lower density of the new mantle provides buoyancy which vertically lifts the overlying crust

Plateau Relatively flat uplifted region Example: Sierra Nevada http://www.scienceclarified.com/landforms/images/ueol_03_img0100.jpg

Fault-Block Mountains Form when large pieces of crust are tilted, uplifted, or dropped downward between large faults Ex: Grand Tetons