The crevasses in the photo to the right are on the Athabaskan Glacier in Alberta, Canada. The people provide an indication of
scale. Debris such as rocks, silt, sand and other particles cover the surface of the glacier giving it a gray color. Some of this
debris may have fallen on the glacier surface from the surrounding valley walls, and some of the debris is material that was embedded
within the glacier and that has been slowly revealed as the ice has melted.
Photo: B. Ford. Used with permission.