Obsidian dome,eastern California. This pyroclastic material formed when slow-moving,silica-rich lava cooled rapidly. It was extruded around 550 years ago. The material is well- preserved because of the arid climate of the region | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gibbons, Bob |
Taille de l’image : | 3508 px × 4961 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |