The ice caves of Mendenhall Glacier are a constantly changing, dynamic space beneath a river of ice. The nature of glaciers is to advance and recede over a period of hundreds or thousands of years, but the current trend of Mendenhall is one of retreat. With the changing climate of today, it is possible that the phenomenon of expanding and withdrawing glaciers will disappear if the head of the glacier does not have cold enough temperatures to produce more snow.Tongass National Forest, Alaska, USA©Two Loons/Erin Lehnert
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