How can the movement of glacier cause lake to form?

Glacial lakes are formed by the erosional and depositional activities of glaciers. In the process, the glacier shapes and create different types of ponds, lakes, and rivers. Here are the possible ways, in which the glacier causes the formation of lakes:

1. Moraine-Dammed Lakes:

As a glacier retreats or melts, it leaves behind debris and sediments called moraine. These moraine deposits can act as natural dams that block the flow of water, creating a lake. As the glacier continues to melt, the ponded water behind the moraine dam rises, forming a moraine-dammed lake.

2.Cirque Lakes:

Cirques are amphitheater-shaped depressions on mountain slopes formed by glacial erosion. When a cirque is overdeepened by glacial ice, it can form a cirque lake. As the glacier retreats from the cirque, water fills the depression, creating a crystal clear and picturesque cirque lake.

3. Paternoster Lakes:

Paternoster lakes are a series of small, interconnected lakes that form along a glacial valley. These lakes are created by the overdeepening of the bedrock by glacial ice, forming basins that collect and store water. Paternoster lakes are also called "stairway lakes" due to their step-like appearance.

4. Piedmont Lakes:

Piedmont lakes are formed when a glacier meets a lowland or a coastal plain. The glacial ice acts as a barrier, blocking the drainage of water from the hinterland. As the glacier melts, the ponded water accumulates and forms a lake at the glacier 's edge. Piedmont lakes are often large and can extend several kilometers in length.

5. Tunnel Valleys:

In some cases, glacial meltwater can flow under the glacier through tunnels formed by the ice. When the glacier retreats or collapses, these subglacial tunnels can become exposed , forming deep, narrow valleys. The meltwater then fills the valleys, creating a tunnel valley lake.