Info Icebergs often has stripes of transparent (so-called black) ice formed in gletcher rifts by melting water, which freeze without having the air bubbles seen in the ordinary white ice, which originate from compressed snow. During iceberg calving, smaller pieces of ice (growlers) detach from the iceberg, and sometimes a black ice growler is formed. These are feared by motor boats sailing in arctic regions as they can be hard to see, and they are very resilient to fracture making them quite dangerous to collide with. -- Slaunger (talk) 20:11, 24 August 2008 (UTC)[reply]
