| Term | Definition |
|---|
| Terminus | Lower edge of a glacier |
| Positive Budget | Glacier expands, more in than out |
| negative budget | Glacier decreases, more out than in |
| advancing glacier | has a positive budget, pushes outward and down |
| receding glacier | negative budget and melts at edges |
| zone of accumulation | snow cover, gains ice, upper part of glacier |
| zone of ablation | ice is lost by melting evaporating or calving |
| Equlibrium line | boundary between zone of accumulation and ablation |
| ablated | lost ice |
| icebergs | free floating ice |
| ice sheet | mass ice that covers large area of land 50,000 km^2 |
| ice cap | smaller ice sheet , may be in mountains |
| valley glacier | confined to a valley and flows from higher to lower elevation |
| alpine glaciation | glacier in the mountainous regions |
| continental glaciation | glacier on the continernt |
| ridged zone | part of glacier where ice stays with itself, doesnt deform much |
| zone of plastic flow | deformable lower part of a glacier |
| basal sliding | sliding of the glacier as a single body over the underlying rock |
| crevasses | open fissures, when the ridgid zone cant stretch enough for a drop or turn. b/c its brittle |
| plucking | glacier gets meltwater into the rocks underneath and frezzes and picks them up |
| faceted | flat surface on rocks from abrasion |
| rock flour | powder from the grinding of rock, makes lakes milky and green |
| U shaped valley | characteristic of how the glacier erodes the floor |
| cirque | steep sided, half bowl shaped recess at the head of the glacier |
| horn | shar peak made by the cirque |
| aretes | sharp ridges |
| till | unsorted unlayered rocks |
| erratic | ice transported boulder that has not been derived from the underlying bedrock |
| end moraine | till formation at the terminus |
| drumlin | unsorted spoon shaped till deposit |
| esker | outwash feature |
| kettle | ice surrounded by sediment from out wash, then melts where a lake forms |
Combine with other sets
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