Processes of glacial transportation
Glaciers move very slowly. As they move, they transport material from one place to another:
- As freeze-thaw weathering occurs along the edge of the glacier pieces of rock, which break off larger rocks, fall onto the glacier and are transported.
- Rocks plucked from the bottom and sides of the glacier are moved downhill with the ice.
- Bulldozing is when rocks and debris, found in front of the glacier, are pushed downhill by the sheer force of the moving ice.
- Rotational slip is the circular movement of the ice in the corrie.
Any material carried or moved by a glacier is called moraine. There are three different types of moraine:
- Lateral moraine - material deposited along both sides of the glacier. This moraine is usually made up of weathered material that has fallen from the valley sides above the glacier.
- Medial moraine - material deposited in the middle of the glacier. This is caused by the lateral moraines of two glaciers when they meet.
- Terminal moraine - material deposited at the end of the glacier.