1. 20.3 – Other Types of Mountain Building

2. 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

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

4. 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

5. Plateau Relatively flat uplifted region Example: Sierra Nevada

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