An amphitheater-shaped depression high on a mountain, which either is or was filed with glacial ice. If the ice has melted, the bottom may conatin a bedrock-basin lake or tarn.
The upper end (headwall) is very steep – erosion by frost and glacial action causes it to migrate headward with time.
Cirque glaciers are no larger than the cirque.
For many valley glaciers the cirque is simply the head of the glacier.
Cirque and valley glaciers are types of Alpine Glaciers.

Low point or pass in a ridge caused by the headward erosion of cirques on opposite sides.

An isolated high peak formed by the intersection of three or more cirques.

Formed by the glacial re-shaping of V-shaped stream valleys.

Weaknesses in bedrock are exploited by the glacier and depressions are formed, which can become filled with water forming a lake when the glacier retreats.
They look like a “string of beads” on a map or when viewed from the air.

Sharp, jagged ridges between adjacent glacial valleys.

Tributary glaciers cannot erode as deeply as the main valley glacier. When the ice recedes the tributary is left “hanging” and a waterfall is usually present.

Areas where bedrock is more resistant to erosion, it becomes rounded and smooth.

Drowned U-shaped valleys.