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polar cap

   Also found in: Dictionary/thesaurus, Wikipedia 0.03 sec.
polar cap [′pō·lər ‚kap]
(astronomy)
Any of the bright areas covering the poles of Mars, believed to be composed of frozen carbon dioxide and water-ice.
(hydrology)
An ice sheet centered at one of the poles of the earth.


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The images, taken by a camera aboard the Mars Global Surveyor spacecraft, provide evidence supporting earlier observations that the Red Planet's south polar cap is shrinking at a rate of about 3 meters every 2 Earth years.
``The south polar cap has been very distinct on Mars,'' he said.
Losi has long focused her attention on geographic sites or plant elements--a glacier in Vorland, 1998, the polar cap in Nord (North), 1998, the Orkney islands in Orkney, 1999, for example.
 
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