Types of glaciers
1. Mountain glaciers: Glaciers that form in mountainous areas.
• Highland icefiels
• Valley glaciers
• Alpine glacier
• Cirque glacier
2. Continental ice sheets: Glaciers from in non mountainous areas. The two main types are Antarctica and Greenland.
Addition of Ice by accumulation of snow
Bedrock is worn down by the rocks being dragged along in the moving ice
term used in geology to refer to the state of gravitational equilibrium between the earth's lithosphere and asthenosphere such that the tectonic plates "float" at an elevation which depends on their thickness and density.
- Process of glacial erosion.
- Rock fractures open up beneath the glacier because of the weight of the ice and because of the freezing and thawing of water in cracks.
- The stress exerted by lowing glacial ice plucks rocks fragments loose and transports them in the direction of glacier flow.
- Particularly effective on leeward slopes and in well-jointed bedrock.
General term for all material moved by glaciers
Rock debris deposited directly by moving or melting of ice, with NO meltwater redeposition involved
- Process of glacial deposition
- General term for glacier-deposited landforms compsed entirely or largely of till.
Smooth, flat alluvial aprons deposited beyond recessional or terminal moraines by streams issuing from the ice.
- Glaciers move down valleys with more effectiveness than a stream.
- A valley shaped by valley glaciers and ice streams within ice sheets that has a distinct trough form.
- Upper portion of a glacier.
- Here the amount of new ice added by snowfall exceeds the amount lost by melting an d sublimation
- Lower portion of a glacier.
- The amount of ice added is less that the amount lost
A ridge of till that marks the outermost limit of glacial advance
Getting bigger or smaller due to relation between ablation and accumulation.
Displacement of ice movement downslope. Always happen even when glacier is retreating
• U-shaped Valley
• Hanging valley
- Rock flour/loess
- Erratics (huge rock)
- Drumlin (elongated, linear feature-opposite of roche moutonnée)
- Outwash plain (sorted material)
- Kettle lakes (big chunk of ice melted)