Glacial ice formation is a process that occurs when snow accumulates and compresses over time, forming large masses of ice. This process can be seen in glaciers, which are large rivers of ice that slowly move down mountainsides. Seracs are large, jagged blocks of ice that form when glacial ice fractures due to the pressure of the glacier's movement. These formations are often found in crevasses and other areas of the glacier where the ice is particularly thin.