How is glacial ice made?
Normal snow is made into glacial ice, which is different from regular ice. The snow that falls has a density of typically 0.05 g/cm3. This snow becomes firn, which is denser than snow (0.50 g/cm3). It is also granular in shape and packed more orderly than snow. After more compaction occurs, ice is made. Its density is about 0.80 g/cm3. Lastly, after remelting, refreezing, and deforming, the normal ice becomes glacial ice, which is even denser: 0.90 g/cm3. Glacial ice can be very colorful, with blue (and sometimes green) hues.
