Here's how:
* Folding: When layers of rock are subjected to compressional forces, they bend and buckle, creating folds. These folds can be large and create hills or even mountains.
* Faulting: When the Earth's crust breaks under stress, it can create fractures called faults. The blocks of rock on either side of a fault can move up, down, or sideways, resulting in dramatic changes in elevation.
Together, folding and faulting can create a complex network of uplifted and depressed areas that contribute to the formation of mountain ranges.
