Science Source December 28, 2009 DVD
EN_00957730_1008
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.
2011-03-20
EAST NEWS
Science Source
Babk Tafreshi
bn8462
4,57MB
57cm x 16cm przy 300dpi
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