EQ3 Flashcards
Fluvio glacial
Erosion or deposition caused by flowering meltwater from glaciers or ice sheets.
Proglacial
Occurring beyond the snout of a glacier.
Moulin
A vertical shaft in a glacier, often round like pot hole, formed by surface water percolated through crack in the ice.
Crevasse
A deep fracture or break on the brittle surface of a surface of a glacier. Caused by the differential movement of parts the glacier at different depths.
Hydrostatic pressure
An increase in pressure in proportion to depths measured from the surfaces due to the increasing weight of ice exerting a downward force.
Cavitation
A process of intense erosion due to the surface collapse of air bubbles found in construction rapid in constriction rapid flows of water.
Kane terrace
Ridges of materials left behind and running along the edge of a valley floor.
Kame
Small mounds left on valley floor.
Esker
A long sinuous ridge left by a retreating glaciers on a valley floor.
Proglacial lake
A lake that forms behind a moraine or ice dam.
Kettle holes
Smalls, often circular, lake left on valley floor by detached ice block melt.
Varve
A thin yearly deposit of sediments on the bottom of a lake. Within each varve there are variation in the colour and texture of the material deposited. The thickness and its associated layers can be used to reconstruct past environmental conditions influencing the lakes.
Outwash plain
Also called a sander; a plain formed of the sediments deposited by meltwater outwash at the terminus of glaciers.
Overflow channels
Often called meltwater channels; these formed as the original course followed by a river before glaciation become blocked or as an overflow of a proglacial lake. They have considerable energy and can gouge and out a new channel. e.g: Ironbridge Gorge.
