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1. The Arctic Circle is an imaginary line around the Earth (at about 66°33' North Latitude) that defines the boundary of the Arctic. It marks the start of the area where, for at least one day each year, the sun does not completely set (June 21) or rise (December 22). (athropolis.com)
2. The Arctic can be defined as the area where average temperature for the warmest month of the year (July) is below 10°C (50°F). (athropolis.com)
3. The Arctic can be defined as the area above the "treeline" (farther north than trees can grow), where there is only tundra and the Arctic Ocean. (athropolis.com)