Valley Glacier and Piedmont Glacier:

A valley glacier is a type of glacier that forms in a mountain valley. It is also known as an alpine glacier. On the other hand, a piedmont glacier is a type of glacier that forms when one or more valley glaciers spill out onto a flat plain.

Differences:
1. Formation: Valley glaciers form in mountain valleys, whereas piedmont glaciers form when valley glaciers flow out onto a flat plain.
2. Shape: Valley glaciers have a long and narrow shape, while piedmont glaciers are wider and flatter.
3. Size: Valley glaciers tend to be smaller in size compared to piedmont glaciers, which can cover large areas.
4. Movement: Valley glaciers flow down a steep slope, following the path of the valley. Piedmont glaciers, on the other hand, spread out and flow in multiple directions due to the lack of confinement from steep valley walls.
5. Terminus: Valley glaciers typically have a terminus that ends in a valley or a fjord. Piedmont glaciers have a terminus that spreads out over a flat plain.
6. Erosion: Valley glaciers erode the sides and floor of the valley they flow through, creating U-shaped valleys. Piedmont glaciers may also erode the underlying landscape, but their main characteristic is the spreading of the ice across a flat plain.

Bergschrund and Crevasse:

A bergschrund and a crevasse are both features found on glaciers, but they are formed in different ways.

Differences:
1. Formation: A bergschrund is a crevasse that forms at the top of a glacier where the ice is moving more slowly than the ice below. It is typically formed due to differential movement between the glacier and the underlying rock. Crevasses, on the other hand, are cracks or fractures in the ice that form due to the stresses caused by the movement of the glacier.
2. Location: Bergschrunds are usually found at the uppermost part of a glacier, near the headwall or the top of a cirque. Crevasses can occur anywhere on a glacier, but they are more common in the middle and lower parts where the ice is under greater stress.
3. Size: Bergschrunds are typically larger and deeper than crevasses. They can extend for several meters or even tens of meters in width and depth. Crevasses, on the other hand, can range in size from a few centimeters to several meters wide and deep.

Corrie Lake and Ribbon Lake:

Corrie lake, also known as a tarn, and ribbon lake are both types of lakes that are formed by glaciers.

Differences:
1. Formation: A corrie lake is formed in a hollow or basin at the head of a glacier, where the glacier has eroded the landscape and left a depression. Ribbon lakes, on the other hand, are formed when a glacier flows over a relatively flat area and erodes the underlying rock, creating a long and narrow lake.
2. Shape: Corrie lakes have a rounded shape and are usually small in size. They are typically found in mountainous areas. Ribbon lakes, on the other hand, have a long and narrow shape, resembling a ribbon. They can be several kilometers long and are often found in areas with low relief.
3. Location: Cor