Page "Polar ice cap" Paragraph 11

Earth's north pole is covered by floating pack ice ( sea ice ) over the Arctic Ocean.

Portions of the ice that don't melt seasonally can get very thick, up to 3 – 4 meters thick over large areas, with ridges up to 20 meters thick.

One-year ice is usually about a meter thick.

The area covered by sea ice ranges between 9 and 12 million km².

In addition, the Greenland ice sheet covers about 1. 71 million km² and contains about 2. 6 million km³ of ice.