12 terms

Glacial erosion landforms

A sharp, knife-like ridge formed between two corries cutting back by processes of erosion and freeze thaw. Bulldozing Ice pushes material of all shapes and sizes as it moves slowly forward.
Corrie (Also called cirque)
Armchair-shaped hollow in the mountainside formed by glacial erosion, rotational slip and freeze-thaw weathering. This is where the valley glacier begins.
Pyramidal peak
Where several corries cut back to meet at a central point, the mountain takes the form of a steep pyramid.
Uk examples of erosion landforms
Snowdonia in North Wales and the Lake District in Cumbria.
Where snow compacts slowly into ice and this accumulates over many years
Moves downhill because of gravity, the mass of the ice, water at its base and the slope it is on. It will move in a rotational movement because of the slope and the overlying pressure.
Corrie lake
Over deepened area of a mountain from plucking and frost shatter filled with water post glaciation
Glacial trough
A river valley widened and deepened by the erosive action of glaciers; it becomes 'U'-shaped instead of the normal 'V'-shape of a river valley.
Hanging valley
A tributary valley to the main glacier, too cold and high up for ice to be able to easily move. It therefore was not eroded as much as the lower main valley, and today is often the site for a waterfall crashing several hundred metres to the main valley floor.
Ribbon lake
Long, narrow lake found in glaciated valleys formed in locations where the glacier had more erosive power, e.g. in areas of softer rock, where the valley gradient temporarily steepened or a tributary glacier joined the main valley.
Truncated spur
A former river valley spur which has been sliced off by a valley glacier, forming cliff-like edges.
DIFFERENTIAL rates of erosion
Erosion at different speeds, because of varying strengths of the bedrock or because there is thicker ice in one region of the glacier than another or because there is more moraine abrading the ground in one region than another.