XIV. Glaciers
see animation on CD-ROM
A. Basics
- parts of glaciers (fig. 19-9
- zone of accumulation
- more snow falls than melts - ice flows downhill
- snow to firn (neve) to ice (fig. 19-8)
- zone of ablation (wastage)
- melting
- sublimation
- calving
- types of glaciers
- alpine glaciers
- continental ice sheets
B. Erosion
- plucking
- abrasion
- striations
- polishing
- glacial flour
C. Deposition
- till - poorly sorted, large grain size, angular fragments
- moraines
- end moraines(fig. 19-18)
- lateral moraines
- medial moraines
- ground moraines - glacial erratics
- drift - fine-grained, well sorted
- varves
D. Landforms
- erosion (fig. 19-27
- U-shaped valleys
- cirques
- horns
- aretes
- roche moutonee (fig. 19-16)
- tarn lake (pater-noster lakes)
- depositional
- moraines (fig. 19-35)
- kettle lakaes (fig. 19-22)
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