Conversely, the McMurdo Dry Valleys of Antarctica, although they have had no ice for thousands of years, are not necessarily polar desert : they are kept " dry " by katabatic wind.
22.
Air temperatures recorded continuously over a 14-year period ending in 1999 declined by about 1 degree Fahrenheit ( . 6 Celsius ) in the polar deserts and across the White Continent, that paper said.
23.
Air temperatures recorded continuously over a 14-year period ending in 1999 declined by about 1 degree Fahrenheit in the polar deserts and across the White Continent, according to prominent researchers from 11 American universities and government laboratories.
24.
The island's Haughton Crater, the result of a meteorite impact about 23 million years ago, is the only such impact crater known to lie in a polar desert environment, which makes it the ideal testing ground for Mars mission spacesuits.
25.
Air temperatures recorded continuously over a 14-year period ending in 1999 declined by about 1 degree Fahrenheit ( 0.55 degrees Celcius ) in the polar deserts and across the White Continent, according to prominent researchers from 11 American universities and government laboratories.
26.
For instance, during the Last Glacial Maximum of 18, 000 years ago, thermal-driven evaporation from the oceans onto continental landmasses was low, causing large areas of extreme desert, including polar deserts ( cold but with low rates of cloud cover and precipitation ).
27.
Air temperatures recorded continuously over a 14-year period ending in 1999 declined by about 1 degree Fahrenheit ( 0 . 55 degrees Celcius ) in the polar deserts and across the White Continent, according to prominent researchers from 11 American universities and government laboratories.
28.
When the sea levels began to rise this bridge was inundated around 11, 000 years BP . During the last glacial maximum, the continent of Europe was much colder and drier than it is today, with polar desert in the north and the remainder steppe or tundra.
29.
When the sea levels began to rise, this bridge was inundated around 11, 000 years BP . During the last glacial maximum, the continent of Europe was much colder and drier than it is today, with polar desert in the north and the remainder steppe or tundra.
30.
The consistently warm, dry, and sunny conditions of the horse latitudes are the main cause for the existence of the world's major non-polar deserts, such as the Sahara Desert in Africa, the Sonoran deserts in the southwestern United States and northern Mexico, all in the Northern Hemisphere; and the Atacama Desert, the Kalahari Desert, and the Australian Desert in the Southern Hemisphere.
