Blue-fissured iceberg
Most icebergs are blue, which is the color of compressed ice from glaciers. Icebergs turn white after a few rounds of melting and freezing. An iceberg may even be green if the ice lived at the bottom of an ice shelf and came in contact with seawater over the centuries. The fissures form when warm air melts ice into pools, which then drips through cracks, widening them. (Photo Credit: Jordan Spielman)