It is an avalanche.
Its called a Caldera.
Its called a Caldera
The collapse of the Old Man of the Mountain in 2003.
Crater Lake formed after the collapse of Mount Mazama.
It is an avalanche.
An avalanche can be rock, dirt, or even snow that falls down a mountain slope.Another term is landslide (landslip). A more specific term is rockslide.
Mass Movement
A cone-shaped mountain on the west coast of North America could be Mount St. Helens in Washington state. Its distinctive shape comes from its volcanic history and the eruption in 1980 which caused the top of the mountain to collapse, forming a new crater.
The noun 'collapse' is an abstract noun when it refers to the failure of something abstract (an emotional collapse, the collapse of the Soviet Union).The noun 'collapse' is a concrete noun when it refers to the failure of a physical structure (a mine collapse, a bridge collapse).
China will not collapse. If it did the world would collapse too
Mountains are limited in height by the forces of erosion. Once a mountain reaches around 40,000 feet in height, the forces of erosion, such as wind and water, are strong enough to wear down the mountain's structure and prevent it from growing any taller. Additionally, the pressure created by the weight of the mountain itself at higher altitudes can cause the rock to deform and collapse.