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Ice on the Land (Key terms)
Fichas del conjunto (15)
- 1What 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. - 2What is the glacier budget?The balance between the inputs (accumulation) and the outputs (ablation) of a glacier.
- 3What 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. - 4What is rotational slip?Slippage of ice along a curved surface.
- 5What is bulldozing?The pushing of deposited sediment at the snout by the glacier as it advances.
- 6What is moraine?Sediment carried and deposited by the ice.
- 7What 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. - 8What is a corrie?A deep depression on a hillside with a steep back wall, often containing a lake.
- 9What is an arete and a pyramidal peak?Arete- a knife-edged ridge, often formed between two corries.
Pyramidal peak- a sharp-edged mountain peak. - 10What 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. - 11What is a truncated spur?An eroded interlocking spur characterized by having a very steep cliff.
- 12What is a ribbon lake?A long narrow lake in the bottom of a glacial trough.
- 13What 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. - 14What is an avalanche?A rapid downhill movement of a mass of snow, ice and rocks, usually in a mountainous environment.
- 15Name 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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- Fichas sobre Ice on the Land (Key terms), creado por AnnaStudies el 28/10/2014.
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