Richat Structure : 無料・フリー素材/写真
Richat Structure / Viva NOLA
| ライセンス | クリエイティブ・コモンズ 表示-改変禁止 2.1 |
|---|---|
| 説明 | A prominent circular feature in the Sahara desert of Mauritania, the Richat Structure has attracted attention since the earliest space missions because it forms a conspicuous bull’s-eye in the otherwise rather featureless expanse of the desert. Described by some as looking like an outsized ammonite in the desert, the structure, which has a diameter of almost 50 kilometers (30 miles), has become a landmark for shuttle crews. Initially interpreted as a meteorite impact structure because of its high degree of circularity, it is now thought to be merely a symmetrical uplift (circular anticline) that has been laid bare by erosion. Paleozoic quartzites form the resistant beds outlining the structure. |
| 撮影日 | 2005-07-30 21:30:28 |
| 撮影者 | Viva NOLA |
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