| 1. | A "'polar circle "'is either the Arctic Circle or the Antarctic Circle.
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| 2. | Twenty-eight men stranded in the Antarctic Circle for nearly two years?
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| 3. | It was the first human settlement south of the Antarctic Circle.
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| 4. | The party then sailed for home, crossing the Antarctic Circle on 28 February.
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| 5. | This was the first expedition to overwinter within the Antarctic Circle.
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| 6. | The course must include set control points at latitudes outside the Antarctic circles.
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| 7. | In the process she became the first steam vessel to cross the Antarctic Circle.
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| 8. | This species is mainly distributed throughout the seas and oceans south of the Antarctic Circle.
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| 9. | Consequently, the Antarctic Circle is currently drifting southwards at a speed of about per year.
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| 10. | The aurora borealis and aurora australis light up the skies of the Antarctic circles respectively.
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