ice sheet
Refers to a large, thick, continental-scale ice mass, such as the Greenland or Antarctic ice sheet.
The Antarctic ice sheet is the largest reservoir of fresh water on Earth.
Melting of ice sheets is one cause of sea-level rise.
ice core
Compound of 氷 (ひょう, 'ice') and 床 (しょう, 'bed' or 'floor'), literally 'ice bed'. The term is a modern scientific coinage.