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Definition:
A moving body of ice that forms on land from the accumulation and compaction
of snow, and that flows downslope or outward due to gravity and the pressure of
its own weight.
Source & ©: Alcwin Dictionary of
Geology 
More:
Source & ©: USGS Benchmark
Glaciers
To read about this term in context: GreenFacts Digest on Arctic Climate Change:
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