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astrobleme |
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astrobleme (ăs`trōblēm'), large, circular structure ranging from c. 1-2 mi to 40 mi (.8–64 km) in diameter. Astroblemes are found at numerous places on the earth's surface, e.g., Meteor, or Barringer, Crater in Arizona, Brent Crater in Ontario, and Vredefort Ring in South Africa. The presence of meteor fragments, strange conical fracture patterns (called shatter cones), and coesite (a superdense, high-pressure form of quartz) in the rocks at astroblemes suggest an impact, rather than volcanic, origin to these circular structures. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Researchers analyzing satellite images of th Sahara have discovered the region's largest impact crater, a 31-kilometer-wide feature located in remote southwestern Egypt. Sudbury is home to the world's largest concentration of mining technology expertise where companies have been mining an impact crater for more than 100 years. Research the following impact crater features: rays, rim, ejecta blanket, wall, floor, central peak. |
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