Why this Alaska glacier is surging ahead of the others?

Two glaciers cascade off Denali. (Photo courtesy of the National Parks Service)Geologic changes typically move slow. But one glacier in Denali National Park and Preserve could be moving at a decidedly un-glacial pace. Scientists think it’s doing something only a small amount of glaciers do, an event called “surging.”
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The Traleika glacier last surged around 60 years ago and experts think it’s on track to do it again.
“It’s just exciting to see the na