glaciers

firnspiegel

a thin sheet of ice formed on the glacier surface by rapid refreezing of solar-heated snow or firn, usually at high elevations during spring.
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firn water table

the height of meltwater within saturated firn that is trapped over ice in a glacier.
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firn line

the minimum elevation of firn lying on a glacier surface; each year's firn line marks a glacier's annual equilibrium line; also called firn limit.
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firn limit

the minimum elevation of firn lying on a glacier surface; each year's firn line marks a glacier's annual equilibrium line; also called firn line.
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firn

rounded, well-bonded snow that is older than one year; firn has a density greater than 550 kilograms per cubic-meter (35 pounds per cubic-foot); called névé during the first year.
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false ogives

bands of light and dark on a glacier that were formed by rock avalanching.
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extending flow

when glacier motion is accelerating down-slope.
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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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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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equilibrium metamorphism

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