Arctic, the

Arctic, the northernmost area of the earth, centered on the North Pole. The arctic regions are not coextensive with the area enclosed by the Arctic Circle (lat. 66°30′N) but are usually defined by the irregular and shifting 50°C (10°C) July isotherm that closely corresponds to the northern limit of tree growth and that varies both N and S of the Arctic Circle. The regions therefore include the Arctic Ocean; the northern reaches of Canada, Alaska, Russia, Norway, and the Atlantic Ocean; Svalbard; most of Iceland; Greenland; and the Bering Sea.

Sections in this article:

• Introduction
• Geology
• Climate
• Flora and Fauna
• Natural Resources
• People
• History of Exploration
• Bibliography

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