Stalactites and limestone pillar in a cave. Stalactites (top) are formed when calcium carbonate precipitates from water droplets as they descend from the roof of the cave. A limestone pillar (centre) forms when a stalactite grows large enough to join with a stalagmite growing up from the floor of the cave. Photographed at the Carlsbad Caverns National Park,New Mexico,USA | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Knauer, Tracy |
Taille de l’image : | 3369 px × 4200 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
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