Hailstones partially covering landscape (28 July 2009) (Cripple Creek-Florissant Road, Teller County, central Colorado, USA) : 無料・フリー素材/写真
Hailstones partially covering landscape (28 July 2009) (Cripple Creek-Florissant Road, Teller County, central Colorado, USA) / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Hailstones partially covering landscape along Cripple Creek-Florissant Road, Teller County, central Colorado, USA (28 July 2009).Hailstones are scarce, ephemeral, polycrystalline, concentrically layered, monomineralic rocks of meteoric origin. They are composed of the mineral ice (hydrogen oxide, H2O). Ice has a low melting temperature for a mineral (= 0˚ Celsius/Centrigrade; = 32˚ Fahrenheit; = 273˚ Kelvin). As a result of this, rocks (hailstones, firn, glacial ice) and sedimentary deposits (snow) consisting of ice are ephemeral, except at very high elevations (mountain tops) and in polar to near-polar facies. Hailstones form in many thunderstorms and can reach the land surface before melting. They range in size from about half-a-centimeter to over 20 centimeters (very large hailstones such as: www.flickr.com/photos/75478688@N08/6804952627/in/photostr... and www.flickr.com/photos/74109683@N03/6807753397/in/photostr... are not really hailstones, but are aggregate hailstones, formed by ice cementing many smaller hailstones together). Hailstones form spherical to subspherical to irregularly-shaped masses.The term "cryometeorites" has been applied to hailstones by some people. Considering that they have a meteoric origin, and do not originate from outer space, this term is inappropriate and is rejected here. |
| 撮影日 | 2009-07-27 23:15:01 |
| 撮影者 | James St. John |
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