A trim line making the previous height of Tana Glacier in Alsaka
A trim line (or trimline) is a clear line on the side of a valley formed by a glacier. The line marks the most recent highest extent of the glacier. The line may be visible due to changes in color to the rock, or to changes in vegetation on either side of the line. A glacier is a large, long-lasting river of ice that is formed on land and moves in response to gravity and undergoes internal deformation. ...
The term "trim line" is also used for similar looking phenomena caused by floods, volcanic activity, or tsunamis.[1] The tsunami that struck Malé in the Maldives on December 26, 2004. ...
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