Depending on where they are located, there are two types of glaciers:
- Cap glaciers. In areas with a polar climate, such as Greenland and Antarctica, where the ice covers the entire relief.
- Alpine glaciers. In high mountains in less cold areas, where the snow does not melt in summer (perpetual snow).
In glacial circuses snow accumulates and becomes ice. The ice flows into the lower areas where it melts (ablation zone). Due to their solid state, the slowly descending glacial tongues of ice have great erosion and transport power, capable of dragging rocks tens of meters long, and leaving valleys in the shape of a "U". In addition, several glacial cirques generate the pyramidal peaks or horn.