Birth, growth and decay of glaciers

At the end of the summer season, alpine glaciers have a clear demarcation between the accumulation area and the ablation area known as the equilibrium line, as here on Vadret Pers, Engadin, Switzerland. The bluish grey ice in the foreground would not be sustainable at this lower level were in not for the ability of ice to flow by sliding and internal deformation from higher levels. JA

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