Figure 3.01. Glacial ice core thin section in crossed polarized light (XPL). Individual ice crystals are visible in the crossed polarized light (XPL) view. All the grains are pure H2O, but have air bubble inclusions. Click on the (PPL) button to see the plane polarized light view. The core is approximately 9 cm across. The thin section was from an ice core collected at a depth of 299.4 meters in the Siple Ice Dome, Antarctica. Image courtesy of Joan Fitzpatrick and Elizabeth Rogers, U.S. Geological Survey, and the National Snow and Ice Data Center, University of Colorado, Boulder.
