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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Greenland ice cores are samplings typically removed from the ice sheet of Greenland by coring into the ice. An 'ice sheet' is a mass of glacier ice that covers surrounding terrain and is greater than 50,000 km2 (20,000 mile2), thus also known as a 'continental glacier'. The only current ice sheets are in Antarctica and Greenland. The Greenland ice sheet occupies about 82% of the surface of Greenland, and if melted would cause sea levels to rise by 7.2 metres. The ice sheet is almost 2,400 kilometers long in a north-south direction, and its greatest width is 1,100 kilometers at a latitude of 77 N, near its northern margin. The ice surface reaches its greatest altitude on two north-south elongated domes, or ridges. The southern dome reaches almost 3,000 metres at latitudes 63 -65 N; the northern dome reaches about 3,290 metres at about latitude 72 N. The crests of both domes are displaced east of the centre line of Greenland. The unconfined ice sheet does not reach the sea along a broad front anywhere in Greenland, so that no large ice shelves occur.

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