Difference between revisions 2241190 and 2242499 on enwikiversity

[[Image:Chain of impact craters on Ganymede.jpg|thumb|right|250px|The image shows a chain of craters on Ganymede. Credit: Galileo Project, Brown University, JPL, NASA.]]
A '''crater''' may be any large, roughly circular, depression or hole in or beneath the rocky surface of a rocky object.

(contracted; show full)|url=http://www.usgs.gov/newsroom/article.asp?ID=3521|accessdate=7 March 2013 }}</ref>

At right is a "[r]ecent airborne geophysical surveys near Decorah, Iowa [which is] providing an unprecedented look at a 470- million-year-old meteorite crater concealed beneath bedrock and sediments."<ref name=Koontz>{{ cite book
|author=Heidi Koontz
|author2=Robert McKay
|title=Iowa Meteorite Crater Confirmed
|publisher=U.S. Geological Survey
|location=
12201 Sunrise Valley Dr, MS 119 Reston, Virginia 20192, USA
|date=March 5, 2013
|url=http://www.usgs.gov/newsroom/article.asp?ID=3521#.UVfS467Qorc
|accessdate=2013-03-30 }}</ref>

"Capturing images of an ancient meteorite impact was a huge bonus," said Dr. Paul Bedrosian, a USGS geophysicist in Denver who is leading the effort to model the recently acquired geophysical data.<ref name=Koontz/> "These findings highlight the range of applications that these geophysical methods can address."<ref name=Koontz/>

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[[Category:Radiation astronomy/Lectures]]
[[Category:Resources last modified in January 2020]]