| A simple three-fold division of the world based upon latitude produces a tropical zone, a temperate zone and a polar zone. |
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| Melting permafrost means that polar bears cannot travel across the polar zone in search of seals. |
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| The expansion of polar zone should not change the equilibrium distribution of matter between polar zone and equatorial zone. |
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| With regard to human activities, the natural zone of high-cold scrub and meadow on the Tibetan Plateau differs clearly from sub polar zone of tundra in northern hemisphere. |
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| The southern polar zone includes Antarctica and the surrounding icy oceans, while the northern polar zone includes regions of Canada, Alaska, Siberia, Greenland, and the frozen Arctic Ocean. |
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| Parallel of latitude at 66°34' S that marks the polar zone, where days and nights last 24 hours during solstices. |
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| She is a strong and fast sailboat which allows for comfortable and in safe saling in the polar zone. |
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| About three-quarters of the total area is ice covered, forming polar deserts which extend over most of the Polar zone in the Southern Hemisphere. |
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| In general the regions of the principal zone are more intense than those of the polar Zone, but on individual days the intensity can be higher in the polar than in the principal zone. |
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