Meteor Crater,Arizona. It is also called the Barringer Crater,after the mining engineer who first suggested that it was formed by a meteor impact. It is about 50,000 years old and is about 200 meters deep and 800 meters across. Several attempts to mine the iron- rich material of the meteor were made before a visitor center was built in the 1960's. Two new minerals - coesite and stishovite - were identified here; both are forms of silica created at high temperatures and pressures. In recent years the crater has been used for astronaut training & studies in planet comparison | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Newman, Mark |
Taille de l’image : | 3354 px × 2261 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : |
|