It is a special type of glacier characterized by a large amount of rock debris scattered on its surface. Usually located in mountainous areas, the flow of glaciers drives rocks and gravel on surrounding slopes, forming a unique snow covered rock landscape. The terrain is complex and varied, and the erosion of glaciers has carved deep canyons and steep cliffs on the mountains. The melting of glaciers and the accumulation of moraines together shape the shape of the earth's surface. Ecosystems are usually relatively simple, but there are still some organisms that adapt to cold environments, such as alpine plants and cold resistant insects. Not only is it a treasure trove of natural beauty, but it is also an important subject of geological research.