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ice field
An ice field (also spelled icefield) is an area less than of ice often found in the colder climates and higher altitudes of the world where there is sufficient precipitation.〔"(Glossary )", ''Gemini.Oscs.Montana.edu'' (dead link)〕 It is an extensive area of interconnected valley glaciers from which the higher peaks rise as nunataks. Ice fields are larger than alpine glaciers, smaller than ice sheets and similar in area to ice caps. The topography of ice fields is determined by the shape of the surrounding land forms, while ice caps have their own forms overriding underlying shapes.
==Formation==
Ice fields are formed by a large accumulation of snow which, through years of compression and freezing, turns into ice. Due to ice’s susceptibility to gravity, ice fields usually form over large areas that are basins or atop plateaus, thus allowing a continuum of ice to form over the landscape uninterrupted by glacial channels. Glaciers often form on the edges of ice fields, serving as gravity-propelled drains off the ice field which is in turn replenished by snowfall.
While an ice cap is not constrained by topography, an ice field is. An ice field is also distinguishable from an ice cap because it does not have a dome-like form.〔Summerfield (1999). , .〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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