翻訳と辞書 Words near each other ・ Polar Circle Marathon ・ Polar city ・ Polar class ・ Polar climate ・ Polar Club Glacier ・ Polar code ・ Polar code (coding theory) ・ Polar code (maritime) ・ Polar concept argument ・ Polar Conservation Organisation ・ Polar coordinate system ・ Polar Cup ・ Polar curve ・ Polar curve (aerodynamics) ・ Polar decomposition ・ Polar desert ・ Polar diagram ・ Polar distance ・ Polar distance (astronomy) ・ Polar drift ・ Polar easterlies ・ Polar ecology ・ Polar effect ・ Polar Electro ・ Polar Epsilon ・ Polar exploration ・ Polar Falcon ・ Polar filament ・ Polar fleece ・ Polar forests of the Cretaceous Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Polar desert ： ウィキペディア英語版 Polar desert Polar deserts are areas with annual precipitation less than 250 millimeters and a mean temperature during the warmest month of less than 10 °C. Polar deserts on Earth cover nearly 5 million square kilometers and are mostly hard bedrock or gravel plains. Sand dunes are not prominent features in these deserts, but snow dunes occur commonly in areas where precipitation is locally more abundant. Temperature changes in polar deserts frequently cross the freezing point of water. This "freeze-thaw" alternation forms patterned textures on the ground, as much as 5 meters in diameter. Most of the interior of Antarctica is polar desert, despite the thick ice cover. 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. Polar deserts are relatively common during ice ages, as ice ages tend to be dry. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polar desert」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.