Block mountains are a type of landform that is formed through the process of faulting. They are characterized by steep, rugged slopes and a relatively flat summit. These mountains are created when large blocks of the Earth's crust are uplifted and tilted along a fault line.

Formation of Block Mountains:
Block mountains are formed due to tectonic forces that cause the Earth's crust to crack and break along fault lines. When the crust moves along these faults, it can result in the upliftment of large blocks of rock. These blocks are then tilted, with one side rising higher than the other.

Characteristics of Block Mountains:
1. Steep Slopes: Block mountains have steep slopes on all sides, which are a result of the upliftment and tilting of the crust along the fault line.
2. Flat Summit: Unlike other types of mountains that may have pointed or jagged summits, block mountains have relatively flat tops. This is because the uplifted blocks of rock maintain their original horizontal orientation.

Examples of Block Mountains:
1. The Sierra Nevada Range in the United States is an example of a block mountain. It was formed as a result of the movement along the Sierra Nevada Fault. The mountains in this range have steep eastern slopes and a more gradual western slope.
2. The Vosges Mountains in France and Germany are another example of block mountains. They were formed due to the upliftment of blocks of rock along the Vosges Fault.

Importance of Block Mountains:
1. Scenic Beauty: Block mountains often have picturesque landscapes, making them popular tourist destinations.
2. Water Resources: The steep slopes of block mountains can act as catchment areas for rainfall, leading to the formation of rivers and lakes in the valleys between the blocks.
3. Natural Resources: Block mountains can contain valuable mineral deposits, such as gold, silver, and copper, which can be economically significant.

In conclusion, block mountains are landforms that are formed through faulting, resulting in the upliftment and tilting of large blocks of rock. They have steep slopes, a flat summit, and can be found in various locations around the world. These mountains have both aesthetic and economic importance, making them significant features of the Earth's landscape.