They eventually surface near the polar icecap. In 1888 Norwegian explorer Fridtjof Nansen and his team crossed the Greenland icecap on skis. When the icecap melts, the lava on top collapses, leaving a flat-topped mountain. In Jeremy Robinson's "Antarktos Rising" (2007), dinosaurs and Nephilim emerge as the icecap melts. The flight started from Svalbard and crossed the icecap to Alaska. Temperatures on the icecap summit of the icecap dropped to at night. Some sources further divide land into "dry land" and "icecap". "Sonic the Hedgehog 3"'s Icecap Zone features pillars topped with rhombicuboctahedra.