Ice Sheet
Extensive continental ice covering >50,000 km2, storing vast quantities of water and freshwater that affect sea level.
Real World
NASA's GRACE satellite data showed Greenland lost approximately 280 billion tonnes of ice per year between 2002 and 2020, enough to raise global sea levels by about 0.8 mm annually.
Exam Focus
Specify both Greenland and Antarctic ice sheets with data — vague references to 'polar ice' will not earn full marks.
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