glaciers

equilibrium line

boundary between the accumulation area and ablation area where the mass balance is zero.
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equi-temperature metamorphism

snow metamorphism that occurs under relatively consistent temperature conditions.
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end moraine

an arch-shaped ridge of moraine found near the end of a glacier.
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dump moraine

a mound or layer of moraine formed along the edge of a glacier by rock that falls off the ice; sometimes called a ground moraine.
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drumlin

remnant elongated hills formed by historical glacial action; it is not clear exactly how they are formed and why they form only in some glaciated regions.
Drumlin field. Manitoba, Canada.
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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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drain channel

preferred path for meltwater to flow from the surface through a snow cover.
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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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destructive metamorphism

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