polar cap


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polar cap

n.
Either of the regions around a planet's poles that are permanently covered with ice or other frozen material. Also called polar ice cap.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

polar cap

1. The mass of permanent ice that covers either of the Earth's polar regions.
2. The mass of frozen carbon dioxide and water that covers either of Mars's polar regions.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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In March this year, Wales was left buried under heavy snow after an SSW saw air above the North Pole collapse and warm the polar cap.
It is "just south" of Olympia Undae, a vast dune field and a well-known polar cap of Mars. 
So it is physically possible that a very salty lake persists beneath the southern polar cap.
Decades ago, the polar cap was a Cold War chessboard for dueling navies and submarine war games.
THE world's first all-electric racing series has driven a car on Arctic ice to raise awareness of the melting of the polar cap.
In central Canada the expanded coverage is available in northern Alberta and Saskatchewan, and central Manitoba, providing additional connectivity for flights crossing over the polar cap region into Canada, primarily flights between Europe and Canada, and Europe and the west coast of the US.
Mars's north polar cap (hearafter NPC) consists of two parts: a seasonal cap and a permanent cap.
Following successful testing, the autonomous data-collection stations were placed deep in the southern polar cap areas under the auroras.
"We found an accelerated accumulation rate of ice in the uppermost 100 to 300 meters of the polar cap," said Dr.
Using images taken by satellites orbiting Mars, the researchers determined that about 20,872 cubic miles (87,000 cubic km) of ice has accumulated at its poles since the end of the ice age, mostly in the northern polar cap.
They compared the ionospheric turbulence over the Northern Hemisphere polar cap to that in the adjacent high-latitude auroral region.