glaciers

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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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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 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 water table

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

glacial troughs that fill with sea water.
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flow finger

a small percolation channel that is a beginning path for surface meltwater through snow or firn.
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foliation

layering in glacier ice that has distinctive crystal sizes and/or bubbles; foliation is usually caused by stress and deformation that a glacier experiences as it flows over complex terrain, but can also originate as a sedimentary feature.
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forbes bands

alternate bands of light and dark on a glacier; usually found below steep narrow icefalls and thought to be the result of different flow and ablation rates between summer and winter.
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forel stripes

shallow, parallel grooves on the face of a large melting ice crystal.
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