glaciers

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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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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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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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end moraine

an arch-shaped ridge of moraine found near the end of a glacier.
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equi-temperature metamorphism

snow metamorphism that occurs under relatively consistent temperature conditions.
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equilibrium line

boundary between the accumulation area and ablation area where the mass balance is zero.
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equilibrium metamorphism

snow metamorphism that occurs when there are large differences in convex and concave portions of a crystal.
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equilibrium zone

zone of a glacier in which the amount of precipitation that falls is equal to the amount that melts the following summer.
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esker

a sinuous ridge of sedimentary material (typically gravel or sand) deposited by streams that cut channels under or through the glacier ice.
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extending flow

when glacier motion is accelerating down-slope.
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