Limestone tufas at Mono Lake,California,USA. These columns typically form when the calcium-rich water from underwater springs meets the carbonate- containing lake water. The resulting limestone (calcium carbonate) precipitates out around the geothermal springs. Tufas can grow to about 14 metres in height. The diversion of some of the rivers supplying the lake caused a dramatic drop in its level,exposing the tufas. Salts,such as carbonates,have become concentrated in Mono Lake,as the lake has no outflow and so water is only lost by evaporation | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Craddock, Tony |
Taille de l’image : | 3114 px × 4523 px |
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