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dipole |
a polar molecule in which the centers of the positive charges are different from the centers of the negative charges. [1/3 definitions] |
Frigid Zone |
either of two polar areas of the earth, north of the Arctic Circle, or south of the Antarctic Circle. |
ozone depletion |
a steady decline in ozone in Earth's stratosphere, or a springtime decline in stratospheric ozone in Earth's polar regions. The primary cause of ozone depletion is man-made chemicals, particularly chlorofluorocarbons (CFCs). |
polar night |
in polar regions, the time of the year when the sun does not rise above the horizon, esp. a period of 24 hours or more when there is no twilight. |
prolate |
of a sphereoid, elongated or extended along the polar axis. |
Temperate Zone |
either of two zones or areas of the earth between the tropics and the polar circles, characterized by seasonal climatic changes; North Temperate Zone; South Temperate Zone. |
timberline |
the land elevation or polar region beyond which trees will not grow. |
whiteout |
a weather condition, usu. occurring in polar areas, in which the snow-covered ground blends into a white sky, blotting out the horizon and destroying the sense of depth, direction, and distance. |
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