1.   Climatic conditions needed to trigger ozone destruction by man-made pollutants were nearly perfect for much of this polar winter.

2.   During the polar winter, a dark period, the flickering, purple aurora borealis lights up the northern sky.

3.   Frigid masses of Arctic air still rule the polar winter, and a southward bulge of this polar chill was a crucial element in producing the blizzard.

4.   If they could survive the dark and cold of polar winters, scientists reason, dinosaurs could not have been the coldblooded creatures they were once thought to be.

5.   Small wonder, then, that many in northern India await the monsoons with the anticipation Arctic dwellers reserve for the end of the polar winter.

6.   After that, the cold and dark of the polar winter make such flights hazardous.

7.   During the mission Sunday, the Starlifter searching in the dark polar winter for a C-shaped chain of blazing barrels which marked the drop point.

8.   She has reportedly been treating herself with chemotherapy since medical supplies were dropped to her in July, after she discovered the lump during the polar winter.

9.   The Amundsen-Scott station cannot be reached by plane during the polar winter because of the extremely low temperatures.

10.   They are regularly serviced by flights during the summer months but batten down the hatches and reduce staffing for the polar winter.