1544632
Description
Flashcards by AnnaStudies, updated more than 1 year ago
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Created by AnnaStudies
over 9 years ago
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| Question | Answer |
| What is accumulation, ablation and the snout? | Accumulation- inputs to the glacier budget, such as snowfall and avalanches. Ablation- outputs from the glacier budget such as melting. Snout- the front of the glacier. |
| What is the glacier budget? | The balance between the inputs (accumulation) and the outputs (ablation) of a glacier. |
| What is abrasion and plucking? | Abrasion- a process of erosion involving the wearing away of the valley floor and sides. Plucking- a process of glacial erosion where individual rocks are plucked from the valley floor or sides as water freezes them to the glacier. |
| What is rotational slip? | Slippage of ice along a curved surface. |
| What is bulldozing? | The pushing of deposited sediment at the snout by the glacier as it advances. |
| What is moraine? | Sediment carried and deposited by the ice. |
| What is a hummock and a drumlin? | Hummock- A small area of raised ground, rather like a large molehill. Drumlin- an egg-shaped hill found on the floor of a glacial trough. |
| What is a corrie? | A deep depression on a hillside with a steep back wall, often containing a lake. |
| What is an arete and a pyramidal peak? | Arete- a knife-edged ridge, often formed between two corries. Pyramidal peak- a sharp-edged mountain peak. |
| What is a glacial trough and a hanging valley? | Glacial trough- a wide, steep-sided valley eroded by a glacier. Hanging valley- a tributary glacial trough perched up on the side of the main valley, often marked by a waterfall. |
| What is a truncated spur? | An eroded interlocking spur characterized by having a very steep cliff. |
| What is a ribbon lake? | A long narrow lake in the bottom of a glacial trough. |
| What is lateral, medial and terminal moraine? | Lateral- a ridge of frost-shattered sediment running along the edge of a glacier where it meets the valley side. Medial- a ridge of sediment running down the centre of a glacier formed where two lateral moraines merge. Terminal- a high ridge running across the valley representing the maximum advance of the glacier. |
| What is an avalanche? | A rapid downhill movement of a mass of snow, ice and rocks, usually in a mountainous environment. |
| Name two different types of avalanches and describe. | Loose snow avalanche- a powdery avalanche usually originating from a single point. Slab avalanche- a large-scale avalanche formed when a slab of ice and snow break away from the main ice pack. |
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