福彩3d近500期走势图带连线

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                        2. Differential Erosion on Ice

                          March 20, 2020

                          Sawyer Glacier bergie bit_smMarch 2020 Viewer's Choice

                          Photographer: James J. Van Gundy 
                          Summary Author: James J. Van Gundy 

                          This approximately 30 foot (9 m) diameter chunk of ice was calved from the active front of , a that sits at the head of the in southeastern Alaska. A house-sized chunk of such as this is often referred to as a in distinction to smaller, piano-sized chunks called and even smaller sized fragments that are referred to in the aggregate as .

                          This particular piece of ice has been rotated approximately 90 degrees from right to left from its original orientation on the face of the glacier. Ice from mountain glaciers is typically with layers of dense clear alternating with thin layers of sediment and layers of white ice filled with air bubbles. These different layers absorb, transmit, and to different degrees. For example, the absorbs nearly all of the long wavelengths of (red, orange, yellow).

                          Ridges and valleys have been into the surface of this ice mass from differential melting by sunlight. Some layers absorb more solar energy than others and therefore melt faster. The resulting surface looks rather like a satellite view of the , a landscape dominated by elongate ridges of resistant rocks and parallel valleys eroded into softer rocks. Although the two landscapes are very different in terms of spatial scale, time scale, materials involved, and , the basic process of different rates of on materials of differing remains the same. Photo taken on August 16, 2018.

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