Historical clue formulations

• Sheets of floating ice — 2024-12-22
• Drift ice pieces — 2019-12-01
• Results of icy breakups? — 2016-11-27
• White sheets — 2016-10-29
• Labrador Sea sights — 2015-05-02
• Penguins' hangouts — 2006-07-19
• Huge ice chunks — 2005-04-11
• Ice sheets — 2003-05-19
• Arctic floaters — 1999-10-06