GEOG 120 Lecture Notes - Lecture 18: Periglaciation, Landform, Novella
Document Summary
Valley glaciers form while draining an ice field. Will erode any bedrocks or soils and transport materials. Firn (partially condensed n v , progresses to firn, but not quite ice) Today: alpine glacial processes and landforms; continental glaciations and landforms; periglacial processes and landform. Glaciers large accumulations of land ice affected by present or past motion. Alpine glaciers high elevation, move due to slope and gravity. Glacial mass balancing determines if advancing (positive) or retreating (negative) Mass gained through accumulation (forms of precipitation) Mass lost through ablation (melting, sublimation, evaporation) Becomes plastic and undergoes internal deformation and shearing. Can move by centimeters or by meters in a given day, depending on climate and other conditions. Ice ablation deposits unsorted till as moraines. Meltwater transports and sorts outwash and deposits it downstream. Ice caps and continental ice sheets (ie. antarctica ice sheet, greenland icecap) Alpine glacial landforms: glacial erosion creates characteristic features in alpine terrain.
