Historical clue formulations

• Greenland expanse — 2026-02-14
• Antarctic mass — 2019-08-18
• Big part of Greenland — 2019-01-05
• Arctic covering — 2009-05-04
• Arctic cover — 2003-03-09
• Polar cover — 2001-11-27
• Winter driving hazard — 1999-08-03
• Greenland feature — 1996-01-13