As the glaciers expand, due to their accumulating weight of snow and ice they crush and abrade and scour surfaces such as rocks and bedrock. The resulting erosional landforms include striations, cirques, glacial horns, arêtes, trim lines, U-shaped valleys, roches moutonnées, overdeepenings and hanging valleys.
What are the main characteristics of a glacial landscape?
Glacier Landforms
- U-Shaped Valleys, Fjords, and Hanging Valleys. Glaciers carve a set of distinctive, steep-walled, flat-bottomed valleys.
- Cirques.
- Nunataks, Arêtes, and Horns.
- Lateral and Medial Moraines.
- Terminal and Recessional Moraines.
- Glacial Till and Glacial Flour.
- Glacial Erratics.
- Glacial Striations.
How do you identify glacial features?
Glacial features are identified from a combination of morphology and ground verification that generally includes examination of available outcrop. Features such as circular depressions on an outwash plain are related to the mode of formation (in this case the melting of buried ice) and can be mapped straightforwardly.
What are the two main types of glaciers?
Glaciers fall into two groups: alpine glaciers and ice sheets. Alpine glaciers form on mountainsides and move downward through valleys. Sometimes, alpine glaciers create or deepen valleys by pushing dirt, soil, and other materials out of their way.
How does a Roche Moutonnee form?
In glaciology, a roche moutonnée (or sheepback) is a rock formation created by the passing of a glacier. The passage of glacial ice over underlying bedrock often results in asymmetric erosional forms as a result of abrasion on the “stoss” (upstream) side of the rock and plucking on the “lee” (downstream) side.
What is glacial deposition?
Glacial deposition is the settling of sediments left behind by a moving glacier. As glaciers move over the land, they pick up sediments and rocks. The mixture of unsorted sediment deposits carried by the glacier is called glacial till.
How does glaciation shape the landscape?
Glacial Erosion Glaciers can shape landscapes through erosion, or the removal of rock and sediment. They can erode bedrock by two different processes: Abrasion: The ice at the bottom of a glacier is not clean but usually has bits of rock, sediment, and debris. It is rough, like sandpaper.
How does glacial erosion shape landforms?
Major features created by glacial erosion include corries, arêtes, pyramidal peaks, truncated spurs, glacial troughs, ribbon lakes and hanging valleys. Corries are bowl shaped hollows with a steep back wall and hollow, forming an armchair shape. They form in hollows where snow can accumulate.
What do glaciers look like?
A glacier might look like a solid block of ice, but it is actually moving very slowly. Alpine glaciers, which begin high up in the mountains in bowl-shaped hollows called cirques. Continental glaciers, which are continuous masses of ice that are much larger than alpine glaciers.
