glaciers

flowline

a line following the spatial pattern of glacier movement from the top to the terminus. Englacial and supraglacial moraines make some glacier flowlines discernible from the surface.

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supraglacial moraine

dust and/or rock that rides the surface of a glacier.

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englacial moraine

dust and/or rock inside a glacier. This debris can become lodged in glacial ice after falling through crevasses.

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cryoconite

A deposit of dust and soot, often bound by microbial mats, that is formed on melting glaciers and ice sheets. The deposits are often found in pothole-like pockets on the ice surface.

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weathering

the processes of ablation and accumulation which gradually eliminate irregularities in an ice surface.

weathered ice

glacier ice that has been exposed to sun or warm wind so that the boundaries between ice crystals are partly disintegrated.
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wave ogives

ogives that show some vertical relief on a glacier; usually the dark bands are in the hollows and the light bands are in the ridges; form at the base of steep, narrow ice falls.
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valley glacier

a mountain glacier whose flow is confined by valley walls.
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tributary glacier

a small glacier that flows into a larger glacier.
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tongue

a projection of the ice edge up to several km in length caused by wind and current; usually forms when a valley glacier moves very quickly into a lake or ocean.
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