National Geographic : 1996 May
1. STORMY SEAS Born from the world's roughest oceans, Ant arctica's giant floes begin as frazil ice (see below) in cold, turbulent water. 2. GREASE ICE As winter approaches and temperatures fall, small crystals clumped together by wind and waves congeal into greasy-looking slicks. 3. PANCAKE ICE Spun around by violent waves, grease ice frag ments and thickens into free-floating disks, some reaching eight feet in diameter.