Difference between revisions 2241195 and 2242501 on enwikiversity

[[Image:Ice cap.jpg|thumb|right|250px|This is an aerial image of the ice cap on Ellesmere Island, Canada. Credit: National Snow and Ice Data Center.]]
'''Earth''' is a rocky astronomical object, a liquid object, a gaseous object, and a plasma object.
{{clear}}

==Astronomy==
{{main|Keynote lectures/Astronomy}}
[[Image:Greenland 42.74746W 71.57394N.jpg|thumb|right|250px|Satellite composite image shows the ice sheet of Greenland. Credit: NASA.]]
(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/>

(contracted; show full)<!-- footer templates -->
{{Radiation astronomy resources}}{{Sisterlinks|Earth}}

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[[Category:Astronomical objects/Lectures]]
[[Category:Earth/Lectures]]
[[Category:Planetary sciences/Lectures]]
[[Category:Radiation astronomy/Lectures]]