Devils Tower National Monument,Wyoming,USA. This basalt tower rises almost 300 metres above a plain. It was formed by the cooling of a plug of underground magma produced by a volcano around 60 million years ago. Erosion of the softer surrounding soil and rock over the centuries slowly exposed the hard rock,causing it to project above the surface | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / West, Jim |
Taille de l’image : | 5125 px × 3417 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |