glaciers

alpine glacier

a glacier that is confined by surrounding mountain terrain; also called a mountain glacier.
Muddy River Glacier carves its way through forested mountains near Frederick Sound in southeast Alaska. Typical of mountain glaciers, it is constrained on all sides by mountainous terrain. (Photo courtesy of U. S. Navy. Archived at the World Data Center for Glaciology, Boulder, CO.)
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advance

when a mountain glacier's terminus extends farther downvalley than before; glacial advance occurs when a glacier flows downvalley faster than the rate of ablation at its terminus.
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active rock glacier

a mass of rock fragments and finer material, on a slope, that contains either an ice core or interstitial ice, and shows evidence of present movement.

accumulation zone

area of a glacier where more mass is gained than lost.
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accumulation season

period during which a glacier gains more mass than it loses; usually coincides with winter.
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accumulation area

area of a glacier where more mass is gained than lost.
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accumulation

all processes by which snow or ice are added to a glacier, this is typically the accumulation of snow, which is slowly transformed into ice; other accumulation processes can include avalanches, wind-deposited snow, and the freezing of rain within the snow pack.

ablation zone

area or zone of a glacier where snow and ice ablation exceed accumulation.
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ablation season

period during which glaciers lose more mass than they gain; usually coincides with summer.
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ablation moraine

mound or layer of moraine in the ablation zone of a glacier; the rock has been plucked from the mountainside by the moving glacier and is melting out on the ice surface.
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