glaciers

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constructive metamorphism

snow metamorphism that adds molecules to sharpen the comers and edges of an ice crystal.
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creep

a way that snow or ice can move by deforming its internal structure.
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crevasse

open fissure in the glacier surface.
Explorers examine a crevasse on Lyman Glacier in 1916. (Photo courtesy of the United States Forest Service. Archived at the World Data Center for Glaciology, Boulder, CO.)
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crevasse hoar

a kind of hoarfrost; ice crystals that develop by sublimation in glacial crevasses and in other cavities with cooled space and calm, still conditions under which water vapor can accumulate; physical origin is similar to depth hoar.
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dead ice

any part of a glacier which has ceased to flow; dead ice is usually covered with moraine.
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depth hoar

a kind of hoarfrost; ice crystals that develop by sublimation within a layer of dry snow; characterized by rapid recrystallization, usually caused by large temperature gradients; similar in physical origin to crevasse hoar; crystals are faceted, rather than rounded.
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destructive metamorphism

snow metamorphism that rounds the comers and edges of an ice crystal.
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dirt cone

a cone-shaped formation of ice that is covered by dirt; a dirt cone is caused by a differential pattern of ablation between the dirt covered surface and bare ice.
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drain channel

preferred path for meltwater to flow from the surface through a snow cover.
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drift glacier

a semipermanent mass of firn formed by drifted snow behind obstructions or in the ground; also called a catchment glacier or a snowdrift glacier.
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