Cwm Idwal - Main Cirque studied in the Nant Ffrancon valley., Lodgement till - Debris deposited by ice due to the build up of friction., Terminal moraine - Found at the furthest advance of a glacier, Recessional moraine - Transverse to the glacier, found where the glacier paused for considerable time during its retreat., Dilatation - Where overlying material is moved, causing fractures in the rock below, parallel to erosion surfaces., Drumlins - Streamlined mounds formed by lodgement till deposits. Long axis orientated parallel to direction of ice movement., Arete - Steep, knife-like ridge formed from the intersection of two cirque headwalls., Extensional flow - Ice movement speeds up at steeper slopes, resulting in the formation of crevasses., Compressional flow - When the slope angle reduces, the ice slows down, causing thrust faults in the ice, closing up crevasses and forming compression bulges., Glacial surges - Periods of rapid movement when a glacier snout advances up to 1000 times faster than normal., Enhanced basal creep - Basal ice deforms around obstacles on the bedrock. No pressure melting., Regelation slip - Pressure melting as pressure builds around an obstacle allows the ice to slip over and re-freezes on the lee side, Devensian - Most recent glacial period that ended arounD 10,000 years ago., Cold based glacier - Found at high latitudes. Ice surface temperatures as low as 30C, No basal meltwater. Move through internal deformation., Warm based glacier - Can be found outside the polar region at high altitudes. Move by basal sliding and internal deformation. Surface temperature fluctuates above and below melting point., Plucking - As cracks are widened by freeze thaw, ice movement removes the rock debris., Abrasion - Individual, angular clasts scrape away at the bedrock as the ice moves, resulting in striations.., Roche moutonee - Abrasion smooths the stops side of an obstacle, regelation slip and freeze thaw results in plucking on the lee side, causing a steep, rough slope.,

Glaciation Quiz Match

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