Ice on the Land (Key terms)

Flashcards by AnnaStudies, updated more than 1 year ago
Created by AnnaStudies over 6 years ago


Flashcards on Ice on the Land (Key terms), created by AnnaStudies on 10/28/2014.

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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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