Geysers steaming at sunset,Yellowstone Park
Numéro d’image : 11745191
| Geysers at sunset. Steaming geysers at sunset. Geysers (Icelandic "geysir" = gusher) consist of deep wells in geothermal rock fissures. Somewhere near the base of the well is a large chamber. The water in the chamber is heated by the surrounding rocks until it is well over normal boiling point,but is prevented from boiling by hydrostatic pressure. The heating also causes the water to expand,spilling from the lip of the well. At a critical point,the loss of water reduces the hydrostatic pressure to a level where the super- heated water boils spontaneously and erupts. Photographed at Yellowstone National Park,USA | |
| Licence : | Droits gérés |
| Crédit: | Science Photo Library / Craddock, Tony |
| Taille de l’image : | 4969 px × 3642 px |
| Model Release : | Non requis |
| Property Release : | Non requis |
| Restrictions : | - |
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