N1852 : 無料・フリー素材/写真
N1852 / FunnyFence
| ライセンス | クリエイティブ・コモンズ 表示-継承 2.1 |
|---|---|
| 説明 | These unusual spires and knobs, 'Tufa's' are formed when calcium-bearing freshwater springs happen to well up through alkaline lake water, which is rich in carbonates. The calcium and carbonate combine, precipitating out as limestone. Over many years, a tower forms around the mouth of the spring. This tufa-forming reaction happens only in the lake itself. As lake level drops and exposes the tufa towers, they cease to grow. |
| 撮影日 | 2003-09-20 16:30:29 |
| 撮影者 | FunnyFence |
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