Here's why:
* Faulting: The Sierra Nevada was formed by a process called normal faulting. This occurs when the Earth's crust is stretched, causing it to break and one block to slide downward relative to the other. In the Sierra Nevada, the eastern side of the range was uplifted while the western side subsided.
* Block Uplift: The resulting fault block, called a horst, was uplifted to form the high peaks of the Sierra Nevada.
* Steep Escarpments: The uplifted block created a steep, almost vertical eastern face (the eastern escarpment), while the subsided block created a gentle slope on the western side (the western escarpment).
Other examples of fault-block mountains include:
* Wasatch Range, Utah, USA
* Hart Mountains, Oregon, USA
* Vosges Mountains, France
* Black Forest Mountains, Germany
These ranges share the characteristic features of fault-block mountains, such as steep slopes, tilted blocks, and a clear evidence of faulting.
