Obsidian and pumice in water. Pumice and obsidian specimens in a beaker with water. Pumice is an igneous volcanic (extrusive) rock with density of about 0.25 g/cm3, therefore it floats in water (density 1 g/cm3). Obsidian is an igneous volcanic glass rock with density of about 2.4 g/cm3, therefore it sinks in water. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Turtle Rock Scientific |
Taille de l’image : | 3431 px × 5148 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |