A close-up view of Hubbard Glacier showing its many layers/strata. In the foreground is the waters of Yakutat Bay, with the glacier's newest face of glacial layers revealed. The black/brown staining that you can see on the glacier is actually sediment and rock that is ground to a fine powdery dirt. This is caused by the glacier's slow movement from the background to the foreground, before calving/falling into the Bay. It takes about 400 years for ice to traverse the length of the glacier, meaning that the ice at the face of the glacier is about 400 years old. The glacier routinely calves off icebergs the size of a ten-story building. Where the glacier meets the Bay, most of the ice is below the waterline, and newly calved icebergs can shoot up quite dramatically, so ships must keep their distance from the edge of the glacier.
Photo captured September 13, 2015.
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