Ocean crust. Cut-away illustration of ocean geology. At top,molten rock rises from the mantle,forming new ocean plate and causing volcanic eruptions. Cooling lava builds up a mid- ocean ridge. Below this,two possible types of ridge are shown. In the Pacific,new plate is formed quickly,leading to a crested ridge (left). Atlantic ridges are slow-spreading with a median valley (right). Below is an enlarged view of the valley,showing layers of rock built up by volcanoes and cooling mantle material. At bottom left is a black smoker,a hydrothermal vent found along all mid-ocean ridges. At bottom right,sedimentary rock forms over the sea floor | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Hks, Gary |
Taille de l’image : | 4729 px × 2980 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |