Streams within or beneath a glacier flow in englacial or sub-glacial tunnels.
2.
It formed in the past 1 million years, which erupted subglacially within an englacial lake.
3.
Variability in temperature, precipitation, and englacial and subglacial hydrology can strongly determine the evolution of a glacier in a particular season.
4.
This volcanic centre formed in a subglacial to englacial environment between 130, 000 and 90, 000 years ago, as shown by the existence of distinctive, radial columnar joint patterns, a glassy to fine-grained matrix and stratigraphic relationships to overlying glacial till.
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