Also called a continental glacier, a large expanse of snow and ice covering a landmass; for example, Antarctica. Ice-sheets can cover entire mountain ranges and can spread across lowlands and oceans. The ice may become very thick: in Greenland and Antarctica there are places where the ice measures 3,000m (9.800ft) in depth, An iceberg formed when ice breaks from the margins of such a sheet may be many square kilometers in area.
An ice-cap is a small ice-sheet, often in the shape of a flattened dome, which spreads over the mountains and valleys of polar islands. The floating ice fields surrounding the North Pole are sometimes incorrectly called an ice-cap.
Related categories GEOGRAPHY
• GEOLOGY AND PLANETARY SCIENCE
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