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• Polar ecology — is the relationship between plants and animals in a polar environment. Polar environments are in the Arctic and Antarctic regions. Arctic regions are in the northern hemisphere, and it contains land and the islands that surround it. Antarctic is… …   Wikipedia

• Polar wind — is the permanent outflow of ionization from the polar regions of the magnetosphere. [http://amsglossary.allenpress.com/glossary/browse?s=p p=43 AMS Glossary] ] Ionospheric Plasma SourceThe ‘ground state’ of the ionosphere consists of the baseline …   Wikipedia

• Polar low — over the Barents Sea on February 27, 1987 A polar low is a small scale, long lived atmospheric low pressure system (depression) that is found over the ocean areas poleward of the main polar front in both the Northern and Southern Hemispheres. The …   Wikipedia

• Polar Bear Expedition — Polar Bear Monument in White Chapel Cemetery, Troy, Michigan, sculptor Leon Hermant …   Wikipedia

• Polar desert — Polar deserts are areas with annual precipitation less than 250 millimetres and a mean temperature during the warmest month of less than 10° C. Polar deserts on Earth cover nearly 5 million square kilometres and are mostly bedrock or gravel… …   Wikipedia

• Polar motion — is the movement of Earth s rotation axis across its surface. This is measured with respect to a reference frame in which the solid Earth is fixed (a so called Earth centered, Earth fixed or ECEF reference frame). This variation is only a few… …   Wikipedia

• Polar moment of inertia — is a quantity used to predict an object s ability to resist torsion, in objects (or segments of objects) with an invariant circular cross section and no significant warping or out of plane deformation.Ugural AC, Fenster SK. Advanced Strength and… …   Wikipedia

• Polar fleece — Polar fleece, usually referred to simply as fleece, is a soft napped insulating synthetic fabric made from Polyethylene terephthalate (PET) or other synthetic fibers. One of the first forms was Polar Fleece created in 1979 by Malden Mills, now… …   Wikipedia

• Polar exploration — is the physical exploration of the Arctic and Antarctic regions of the Earth. It is also denotes the historical period during which mankind most intensely explored the regions north of the Arctic Circle and south of the Antarctic Circle.… …   Wikipedia

• polar ecosystem — Introduction       complex of living organisms in polar regions such as polar barrens and tundra.  Polar barrens and tundra are found at high latitudes on land surfaces not covered by perpetual ice and snow. These areas lying beyond the tree line …   Universalium

• Polar bear — This article is about the animal. For other uses, see Polar bear (disambiguation) …   Wikipedia