They form from summertime erosion beneath a large crevasse called a bergschrund [BURG-SHRUND] which separates the stationary from moving ice.
Their back ends are comprised of cliffs called headwalls, which ideally are semicircular, but this phenomenon only occurs when these formations are cut into flat plateaus. They form from summertime erosion beneath a large crevasse called a bergschrund [BURG-SHRUND] which separates the stationary from moving ice. The resulting avalanches scour a concave floor and are incorporated into the glacier, producing a bowl-shaped depression. When the ice melts, water often remains, forming a mountain lake called a tarn inside. FTP, name these amphitheatre-shaped basins found at the head of a glacial valley.
Their back ends are comprised of cliffs called headwalls, which ideally are semicircular, but this phenomenon only occurs when these formations are cut into flat plateaus.
cirque